Atrichopogon rarus, Johannsen, 1946

Johannse, O. A., 1946, Some New Species Of Nemocerous Diptera From Guam, Insects of Guam II, Honolulu, Hawaii: Bernice P. Bishop Museum, pp. 187-193 : 188-190

3. Atrichopogon rarus , new species.

Male and female: head and antennae dark brown, the pedicel of the antenna and the mouth parts yellow. Thorax yellowish brown to brown, more or less shining, mesonotum with three dark brown vittae, in some cases coalescent, in other cases scarcely darker than the background, lightly yellow pollinose. Scutellum yellowish brown to brown, scarcely lighter than the mesonotum. Abdomen fuscous, contrasting with the lighter thorax and terminalia. Legs, including coxae, yellow to yellowish brown, tarsi somewhat darker apically. Hind basitarsal-tibial ratio 0.4. Claws cleft. Eyes contiguous, bare. Antennae 15-segmented (counting the minute scape); in the male segments 12 to 15 combined about a third longer than segments 3 to 11 combined, 3 to 11 short fusiform, 12 to 15 cylindrical, the latter having the proportions 7: 20: 14: 17; apical segment with stylet. In the female antennal segments 11 to 15 combined nearly 2.5 times as long as 3 to 10 combined, 15 slightly longer than 14, 11 to 14 subequal; 3 to 10 approximately spherical. Palpi in both sexes five-segmented, third longest and with a sense pit, fourth and fifth subequal, the fifth somewhat spatulate.

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Wings in both sexes with coarse microtrichia, that of the male without macrotrichia, of the female with macrotrichia on the distal third but extending back over the cubital cells. In the male the costa ends at 0.7 wing length measured from the cubital crossvein, that of the female at about 0.75 wing length; in both sexes the first radial cell is about a fourth as long as the second; angle between branches of the cubitus less than 70 degrees in the male, nearly 90 degrees in the female, its fork on level of the tip of first radial cell; petiole of the media shorter than the r-m crossvein. Halteres brownish. Length of body 2.25 mm., of wing 1.8 mm.

Piti, swarming on leaves of Intsia bijuga , Sept. 14 , May 9 , Nov. 4, Swezey ; Agat , Oct. 17, Swezey.

Holotype and allotype in the collection of Cornell University, paratypes in the collections of Cornell University and of the Experiment Station, Hawaiian Sugar Planters' Association.