296 ' Journal New York Entomological Society, tvoi. xxi. 



calypteres white. Front shining, the transverse impression above the an- 

 tennee shallow and provided with scattered proclinate hairs, that part of the 

 front before the ocelli nearly square ; ocellar bristles small, postverticals cru- 

 ciate, two reclinate fronto-orbital bristles, the anterior at the middle of the 

 front; ocellar triangle and orbits polished, the M-shaped mark between some- 

 what sericeous ; face short, greatly receding, carinate only between the an- 

 tennae, facial grooves broad and shallow, cheeks almost bare and about one 

 seventh the eye-height. Mesonotum almost devoid of dust, highly polished, 

 the humeri and the notopleural suture lightly gray-pruinose ; two dorsocentrals, 

 acrostichals rather sparse, fine and irregular ; pleurae very lightly pruinose, 

 one mesopleural and two sternopleural bristles, no prothoracic, no setulae. 

 Abdomen highly polished, but the basal three segments show very sparse 

 pollen, the last segment short and compressed. Legs short, the femora not 

 robust, bristles of front femora fine, no tibial bristles, but the middle tibise 

 with a small apical spur. Wings narrow, hyaline, whitish at base, veins be- 

 coming light brown apically ; the auxiliary vein almost touching the first vein 

 before its end, the first vein continuing straight and ending in the costa much 

 before the middle of the wing, the costa, however, unbroken ; third vein ending 

 a little before the wing-tip ; penultimate section of the fourth vein less than 

 one half as long as the ultimate section ; the sections of the fifth vein propor- 

 tioned about three to one. 



One specimen, Avon, Idaho, July 26, 1912. 



TRIXOSCELIS Rondani. 



Mesonotum whitish gray, with two indistinct brown vittae ; costal margin of 

 wing between the first and second veins brown ; four dorsocentrals ; 

 legs yellow, the coxae and front legs dark brown ; antennae brown. 1.5 

 mm. (Galapagos Isl., Ariz.) (?canescens Loew, Eur.) (Parodinia: 

 Rhicnoessa.) costalis Coquillett. 



Mesonotum cinereous ; wings hyaline, the costa not bordered with brown ; five 

 dorsocentrals 2. 



2. Antennas entirely yellow, the third joint at most infuscated 3. 



Third joint of antennae black; legs yellow, the tarsi brownish. 2 mm. 



(Cal.) (Parodinia.) cinerea Coquillett. . 



3. Front legs, except the white coxae, black, the posterior legs yellow ; pollen 



of upper edge of mesopleurae slightly brownish. 2.5 mm. (Eur.; 



Id.,* Wash.,* Cal.,* B. C.*) frontalis Fallen. 



At least the tibiae and tarsi yellowish, or the front legs not darker than the 

 others ; thorax uniformly cinereous pollinose 4. 



4. Legs entirely yellowish, including the coxae ; face yellowish. 2.5 mm. (Cal.,* 



Wash.*) (Wien, ent. Ztg., XXX, 43, 1911.) prima Hendel. 



Coxae and femora blackish, the tibiae a little infuscated ; center of face 

 dusky. 2 mm. (Cal.) (Trans. Am. Ent. Soc, XXXIV, 100, 1908, 

 Siligo.) litorea Aldrich. 



