NEW MUSCOID FUES FROM THE ANDEAN MONTANYA 139 



known by the following characters : Eyes practically bare, with only very 

 sparse faint short hairs. Pareifacials pilose. Palpi represented by two 

 bristlets. Cheeks pilose, about equcJ to two-thirds eye-height in both 

 sexes. Second antennal joint strongly elongate, about as long as third ; 

 second aristal joint conspicuously elongated ; third antennal joint of male 

 wider than that of female, broad-oval, conspicuously convex and bulged 

 on front edge. Proboscis when fully extended about one and one-third 

 to one and one-half times head-height, neither particularly stout nor very 

 slender. No ocellar bristles. Vertex of female about as wide as one 

 eye seen from above, that of male about two-thirds such width. 



Three sternopleural, and four postsutural bristles; the postacrostichal 

 bristles usually three. Scutellum with two pairs of subappressed laterjil 

 marg'ncJ macrochaetae, with or without a very weak suberect decussate 

 or nondecussate apical pair ; with the erect disced spinelike macrochaetae 

 in two or three transverse rows, usujJly but not jJways less abundant 

 when the weak apical pair of bristles is present. The characters of the 

 abdominal macrochaetae are variable within the foUowing limits : First 

 segment with only lateral marginal and lateral discal in a bunch ; but often 

 the discal are weaker and more pointed, sometimes even bristlelike. 

 Second segment with lateral marginal and lateral discal in heavier bunch, 

 the discal varying from few to a dense setting ; with complete marginal 

 row, or with marginal only in middle and at sides, in either case there 

 being two heavy separated median marginal with none or usually one but 

 sometimes two shorter pairs between them on margin ; with median dis- 

 cal bunch of from two to seven pairs. Third segment with ordinary to 

 very thickly set marginal row ; with few to many lateral discal as well as 

 lateral marginal ; with two to seven pairs of median discal in a transverse 

 row or in an irregular bunch, this bunch or row connected with the lat- 

 eral margin of segment by an oblique or irregular row of two to four or 

 more macrochaetae, forming a complete transverse discal row across the 

 segment. Anal segment bare of macrochaetae on about its forward half, 

 the macrochaetae densely bunched on posterior half but often in more or 

 less definite rows, sometimes with a median discal pair more or less con- 

 spicuously separated from the mass. The anal segment of female is much 

 narrowed posteriorly and is gently but distinctly emarginate behind, the 

 terminal bristles from the two buttocks being decussate. In the male the 

 anal segment is still more tapered posteriorly and shows no emargination. 

 The abdominaJ macrochaetae are spinelike. Venation practically same 



