I 



NEW MUSCOID FLIES FROM THE ANDEAN MONTANYA 123 



strongly curved, slender, unidentate, the pulvilli rudimentary. Genitalia : 

 Basal clasp segment moderately long, stout ; terminal clasp segment short, 

 stout, tapering ; dorsal plate short, broad, deeply and roundly emarginate, 

 the lobes narrowly rounded ; ventral plate long, deeply and roundly 

 emarginate, the divergent lobes narrow^ly rounded, setose. Harpes fused 

 mesially, the ventral margin feebly and irregularly serrate. 



Female: Length, 1 .5 mm. Very nearly as in the male so iai as may 

 be determined by badly broken specimens. The second pdpal segment 

 has a length nearly three times its diameter and the third is a little longer 

 and more slender than the second. Ovipositor short, the terminal lobes 

 narrowly lanceolate and sparsely setose. Type Cecid 1529a. 



NEW MUSCOID FLIES, MAINLY HYSTRICIID>« AND 

 PYRRHOSIINi^ FROM THE ANDEAN MONTANYA 



By CHARLES H. T. TOWNSEND 

 (Continued (rora page 96) 



Euslgnosoma, new genus. 



Differs from Signosomopsis as follows : Description drawn from both 

 sexes. Abdomen much rounded, still more nanowed apically, not at all 

 emarginate in either sex. Length of anal segment on median line varies 

 from conspicuously less than combined length of first to third segments on 

 same line, the second and third segments being in such czise much longer 

 than in Signosoma and Signosomopsis, to about equal that of the first 

 three segments. Pollinose marking of anal segment when present and its 

 corresponding space when absent with from one to three or more pairs 

 of macrochaetae, the pollen when present reaching sides of segment or 

 not. Hind margin of first and second segments wavy in middle in both 

 sexes, sometimes that of second segment in male not so, that of third seg- 

 ment in female at best faintly so. Second and third segments with single 

 sparse margined row of macrochaetae, that of second segment usually inter- 

 rupted on each side of middle but sometimes entire, both usually with only 

 one but sometimes two pairs of median discal macrochaetae, and with 

 rather strong thickly placed lateral discal bristles or only short bristly hairs. 

 Abdominal macrochaetae not so spinelike ; no spines on venter but only 

 bristles and bristly hairs on median line. Scutellum with weak but dis- 

 tinctly spinelike macrochaetae, discal and marginal; the erect posterior 



