Czernyola atrifrons, Malloch, 1942

Mailoch, J. R., 1942, Trypetidae, Otitidae, Helomyzidae, And Clusiidae of Guam (Diptera), Insects of Guam I, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 201-210 : 209-210

Czernyola atrifrons , new species.

Female. Head testaceous yellow, frons glossy black, with a fulvous spot in center of anterior margin; antennae reddish yellow, third segment sometimes slightly browned on upper edge; palpi pale yellow; parafacials and genae silvery white dusted; occiput glossy black, yellowish below. Frons with the usual three strong orbitals, second pair incurved and almost in line with the others; ocellar bristles fine and much shorter than orbitals, about equal to the postvertical pair; gena about half as high as width of third antenna! segment. Thorax glossy fulvous yellow, mesonotum with a large black oblong mark on center behind suture that extends to posterior margin, and a black mark of variable size on anterior margin which is sometimes tridentate behind and with traces of central and lateral lines extending back to postsutural mark; a large black mark covering upper half or more of mesopleura, and another on metapleura; scutellum fulvous yellow. Bristles all black, arranged as follows: 1 humeral, 2 notopleurals, 2 pairs of long posterior and 1 very short pair of anterior dorsocentrals, 1 supra-alar, 1 very long and 1 very short postalar, 2 long apical and 2 very short lateral pairs of bristles on scutellum, 1 mesopleural, and 1 sternopleural. Mesonotum rather strongly haired; propleura finely haired on sides. Legs yellow. All tibiae with preapical dorsal bristle, the one on fore tibia short and fine, the others strong and long, mid tibia with a shorter posterodorsal bristle nearer apex than the usual one slightly over center of dorsum and almost on anterodorsal surface, and a long apical ventral bristle. Wings brownish hyaline, with a pale rather diffuse brown cloud on apical costal half, veins dark brown. Inner cross vein at one third from apex of discal cell; penultimate section of fourth vein about one fifth as long as ultimate vein. Abdomen more or less extensively blackened, sometimes only genital segments yellow. Length, 3 mm.

Dededo, May 19, Usinger , type; Guam, no other data, Fullaway , 2 paratypes .

The Samoan species C. palliseta Malloch , differs from C. atrifrons in having the cephalic and thoracic bristles yellow, and the thorax except the lower portion of the pleura entirely black. The Formosan species, C. biseta Hendel , has the thorax and abdomen black, and the hind femora with a preapical brown ring. Both of these species were described from males. It is possible that one or the other of them may be the male of C. atrifrons , but this is hardly probable, the amount of difference in color characters being exceptional in a species of this genus.