326 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 43. 



Head cinereous pollinose, the parafrontals with a dusky shade, the 

 parafacials more silvery, the cheek-grooves brownish-red, the fronta- 

 Ha brown; the entire facial plate pale brownish-yellow, thinly silvery 

 pollinose. The frontalia show pollen in oblique view. Palpi brown- 

 ish-yellow, faintly reddish. First two antennal joints reddish-yellow, 

 third joint and arista dark brown. Occiput with brassy-gray pile. 

 Thorax blackish, thinly silvery pollinose, with a heavy median 

 black vitta extending to a point half way between suture and scutel- 

 lum; on each side a narrower vitta interrupted at suture. Scutellum 

 blackish, reddish on margin, thinly silvery pollinose. Abdomen 

 blackish above except broad lateral and apical margins, which are 

 brownish-yellow and thickly golden pollinose, the blackish portion 

 silvery pollinose. Legs blackish or dark brown, the tibise reddish. 

 Wings faintly yellowish on base, this color following the principal 

 veins. Tegulae whitish, narrowly margined with yellowish. 



Type.— C&t. No. 15164, U.S.N.M. 



ERIGONOPSIS, new genus. 



Characters of Dolicliostoma except: Head much shortened, the 

 parafacials hardly more than one-half eye-width. Mean width of 

 cheeks about two-thirds eye-height. Three proclinate and one diver- 

 gent orbital bristles in line in female, Male antennae practically 

 same as female, third joint being but little longer than second, vertex 

 of male about two-thirds eye-width, male without any orbital bris- 

 tles, mean width of cheeks about one-half of eye-height. Claws of 

 male fully one-third longer than last tarsal joint. Proboscis below 

 geniculation rather less than height of head, strongly laterally com- 

 pressed; palpi slender, filiform, and short, one-half as long as in 

 Dolichostoma. Abdominal macrochaetae stronger. Apical cell open 

 to almost closed; the hind crossvein sometimes extremely close to 

 apical crossvein, the distance not exceeding length of small cross vein. 



Reproductive habit, leaf-larviposition; uterus straplike, with col- 

 ored maggots. 



Type-species. — Erigonopsis arequipse, new species. 



ERIGONOPSIS AREQUIP^, new species. 



Length of body, 9.5 mm.; of wing, 6.5 mm. Six females and one 

 male, Arequipa, Peru, January 25, 1910, on flowers of composites. 



Parafrontals and parafacials deeply to faintly golden pollinose, 

 those of male deeply silvery with golden reflections. Facial plate 

 yellowish, silvery pollinose. Frontalia brown. First two antennal 

 joints reddish-yellow, third joint and arista blackish. Palpi pale 

 yellowish, smaller in the single male than in any of the females. 

 Cheeks and occiput cinereous, the latter with light to deep golden 

 pile. Pleurae, mesoscutum and scutellum thinly silveiy pollinose, 

 pollen of mesoscutum with a faint golden tinge and leaving three black 



