ABT. 11 SIPHOSTURMIA AND ALLIED GENERA EEINHARD 7 



facial bare, at narrowest about as wide as third antennal joint; 

 face not much receding, rather shallow or flat, with the lower edge 

 moderately protruberant, the ridges bare except a few bristly hairs 

 next to vibrissae; the latter somewhat approximated and situated 

 near the oral margin ; antennae fully three-fourths the length of face, 

 third joint black, two and one-half to three times as long as second, 

 basal joints faintly reddish; arista shorter than antennae, thickened 

 on proximal two-fifths, penultimate joint at least twice as long as 

 wide ; cheek in profile one-sixth the eye height, gray pollinose on red 

 ground color, bearing numerous fine black hairs; proboscis moder- 

 ately slender, about equal the height of head; palpi yellow, slender, 

 the tips bowed upward bearing a few black hairs beneath ; posterior 

 surface of head bulging backward at middle below, wholly gray 

 pollinose and clothed with pale hairs ; eyes practically bare. 



Thorax gray pollinose, dorsum with four shining black stripes in 

 front and five behind suture ; scutellum broadly reddish, with thinner 

 gray pollen on disk which bears numerous erect bristly hairs. 

 Chaetotaxy: Acrostichal, 3, 3; dorsocentral, 3, 4; humeral, 4; posthu- 

 meral, 2; notopleural, 2; presutural, 2; intraalar, 3; supraalar, 3; 

 postalar, 2 ; sternopleural, 2, 2 ; scutellum with three pairs of laterals, 

 one smaller decussate apical pair, and one pair of discals; post- 

 scutellum well developed, thinly gray pollinose; calypters opaque, 

 white, the rims faintly yellowish. 



Abdomen black with a reddish tinge along the sides; intermediate 

 segments gray pollinose on basal two-thirds, the hind margins shin- 

 ing; apical half of fourth also shining, black, the basal pollinose cross 

 band widest at middle above, becoming narrower outward and stop- 

 ping at side ; a median black stripe visible in some angles, not vei'y 

 conspicuous; first segment with one pair of weak median marginals; 

 second also with one pair, larger; third bearing a marginal row of 

 about eight; fourth with several irregular rows on apical half; 

 genitalia small, retracted; inner forceps blackish, long and slender, 

 divided on apical half or more, the tips blunt, not divergent, in 

 profile very straight and almost uniform in thickness from apex 

 to base; outer forceps about three-fourths the length of inner ones, 

 with a broad yellow base, tapering from middle to blunt or rounded 

 tips, which are blackish and beset with very minute black hairs ; penis 

 hardly at all thickened apically; fifth sternite with a broad U-shaped 

 incision. 



Legs black ; middle tibia with two large bristles on outer front side 

 near middle; hind tibia subciliate, the median bristle much stouter 

 and longer ; claws and pulvilli exceeding length of apical tarsal joint. 



Wings subhyaline, tinged faintly with yellow on costa near base; 

 fourth vein with a sudden rounded bend, concave shortly beyond. 



