Exoryza minnesota Mason

Valerio, A. A., Deans, A. R. & Whitfield, J. B., 2004, Review of the microgastrine braconid wasp genus Exoryza, with description of a new species, E. monocavus, from Central America, Zootaxa 526, pp. 1-11 : 8-10

Exoryza minnesota Mason

( Figs. 2, 4 , 6 )

Exoryza minnesota Mason, 1981 , Mem. Entomol. Soc. Can. 115: 40. Holotype in Canadian National Collection, examined.

Female. Body length = 3.3 mm.

Body color. Hind coxae, hind trochanters yellow as are hind femur (except distal tip), and metasomal anterior two pleura; remainder of tarsomeres light brownish yellow as remainder of metasomal pleura, hypopygium (except longitudinal medial area whitish yellow), mandibular palpus, metasomal terga (except metasomal terga 1 and 2 black), and ovipositor sheaths; hind coxae black at base, then reddish, remainder yellow; metasomal interpleural membrane whitish; antenna brownish yellow including scape and pedicel; maxillar palpus whitish; lunulae and transversal area including area in front of scutellar groove reddish brown; ocelli yellow; compound eyes silver; remainder of body dark brown. Wings hyaline with veins brownish yellow.

Head. Head height/width = 0.12; compound eye height/width = 2.7; intertentorial pit distance = 0.18 mm; intertentorial pit distance/distance from tentorial pit to compound eye = 2.3; width of face at dorsal clypeal edge = 0.35 mm; clypeus width/height = 2.7; vertex width/distance between anterior ocellus and edge of torulus = 2.2; length of first flagellomere = 0.2 mm; first flagellomere length/width = 4; length of first flagellomere/ length of second flagellomere = 1; length of first flagellomere/length of third flagellomere = 1; distal flagellomere length = 0.15 mm; distal flagellomere length/subdistal flagellomere length = 1.3; distal flagellomere length/width = 1.8; malar space height/basal width of mandible = 0.9; ocell­ocular distance/lateral ocelli distance = 1.2.

Head strongly and conspicuously punctate; less evident and finer on clypeus than on face; scrobal areas of frons with transversal lineate sculpturing on basal 1/3, remainder of scrobal area nitid, lateral areas strongly punctate and distal area with shallower punctate sculpturing as on vertex that is less deeply impressed than lateral sculpturing; ocular ring nitid as on upper area of postgena, remainder of head with dense punctate sculpturing.

Mesosoma. Mesosoma length/width = 1.3. Propleuron with dense punctate sculpturing; pronotal lateral area nitid, upper and ventral groove with sparse and widely spaced scrobiculate sculpturing, area between grooves with confused rugulose sculpturing, dorsal and ventral edge 1/6 of distal edge height; mesonotum densely punctate except area next to scutellar groove nitid; scutellar groove with 7 widely spaced costulae, lateral costulae 4 times shorter than medial one; scutellum with confused punctate sculpturing throughout, lateral area with narrow and well defined scrobiculate sculpturing which becomes more elongate and wider distally, lunulae triangular in shape; axilla through mesonotum with sparse transverse and narrow ridges present on anterior 1/3, remainder nitid; metapleuron mediodistal pit divided longitudinally, anterolateral areas nitid above but below with rugulose sculpturing; propodeum with anterolateral areas with dense coarse rugose sculpturing, areola with rugulose sculpturing and appearing sunken into the propodeum relative to posterolateral areas; posterolateral areas anteriorly with rugulose sculpturing and distally and along lateral carinae with sparse weak rugulose sculpturing, medial area nitid; mesopleuron mostly covered by aciculopunctate sculpturing, sternaulus appearing as an elongate and shallow longitudinal depression, dorsal area with well defined and dense scrobiculate sculpturing, distal edge with aciculopunctate sculpturing, medial area distally nitid; metapleuron with medial pit present, anteriorly nitid, remainder with confused dense rugulose sculpturing, dorsal and distal edge with large and widely spaced transverse ridges.

Legs. Hind femur length/width = 4.4; hind tibia length/hind femur length = 1.4. Tarsal claws simple.

Wings. Forewing length = 2.8 mm; 1CUa length/2Cub length = 0.94; length RS+Ma = 0.35 mm; length M+CU = 1.0 mm; 1M length/ m­cu length = 1.9; pterostigma length/ height = 1.9. Hindwing: 1M length = 0.5 mm; 1M length/2M length = 2; 1M length/ M+CU length = 1.7; length r­m/length Cua = 1.3; 1 RSa length/2r­m = 1.8.

Metasoma. First tergum length/distal width = 1.0; second tergum length/distal width = 0.31; third tergum length/distal width = 0.21; hypopygium length = 0.88 mm; First and second metasomal terga with dense coarse rugulose sculpturing; first metasomal terga with longitudinal medial depression shallow and short; third metasomal terga with shallow punctate sculpturing at anterior edge, remainder tergum nitid; remainder of metasomal terga nitid; hypopygium medially with desclerotized pleats present, distal tip of hypopygium slightly divided; ovipositor sheaths wider at distal tip and tip subrectangular in lateral view; ovipositor thin throughout its length.

Material examined. Female, “ Canada, Ontario, Point Pelee, 28 July 1928, Col. J.M. Cumming.” Specimen deposited in INHS.

Comments. This species can be separated from the other species of Exoryza by the forewing vein ratio of the lengths of 1CUa/1Cub larger than 0.90 and the metapleuron being completely covered by rugulose sculpturing.

Rearing records. Host unknown.

Figures

FIGURES 1 – 5. 1: Exoryza monocavus, female, lateral habitus; 2,3: Forewing 1 ­ CU of E. minnesota and E. schoenobii, respectively; 4,5: Mesopleura of E. minnesota and E. schoenobii, respectively. Scale = 0.5 mm.

FIGURE 6 – 8. Metasomal tergites I – III of: 6, Exoryza minnesota, 7, E. schoenobii, 8, E. monocavus. Scale = 0.5 mm.