DASYPOGONINAE 



ROBBER FLIES OF THE WORLD 



197 



bristles on the mesonotum; the face in these species 

 may be a little more gibbous, the frontal and ocellar 

 bristles longer and more numerous. Length 10 to 

 13 mm. 



Head, lateral aspect : The head is of moderate length, 

 the face short, gently convex beginning at the base of 

 the antenna and less prominent than in Comantella. 

 The occiput is similar to that genus, tumid, strongly 

 developed in the middle and below and the postero- 

 ventral recession of the eye begins above the upper third 

 of the head. The eye is shorter and in effect consider- 

 ably higher than in Comantella. Occipital pile dense 

 and long with weak bristles beginning at the upper 

 fourth and usually consisting of 7 or 8 pairs. The 

 proboscis is short, scarcely extending beyond the face ; 

 it is robust, plane below, rounded and punctate dorsally 

 at the apex, and with a medial carina over the middle 

 and base ; it has numerous, long hairs ventrally on the 

 basal half. Palpus small, of two segments; the first 

 segment, hemicylindrical and excavated, the second 

 slender and cylindrical, with rather fine, long, bristly 

 pile; the apex is bare and microporate. Antenna at- 

 tached near the middle of the head, not quite as long 

 as the head, the first two segments short and subequal. 

 The third segment is widest at the base, rather strongly 

 attenuate, with two slender microsegments ; the first is 

 short, the second long and tapered, with apical spine. 

 These two microsegments combined are nearly as long 

 as the third segment. 



Head, anterior aspect: The head is wide, the face 

 quite wide; below the antenna the face is nearly one- 

 third the head width, and moderately divergent below. 

 Face pubescent with some fine, long pile and with nu- 

 merous, long, slender bristles especially on the lower 

 half. The epistomal bristles are poorly developed. 

 Subepistomal area moderately large and nearly hori- 

 zontal. The front is flat, pollinose with a tuft of long 

 hairs along each eye margin near the vertex. First 

 and second antennal segments with long, coarse hairs 

 above, laterally, and below and 1 or 2 long bristly hairs 

 at the apex of the second segment. Vertex moderately 

 excavated, the ocellarium large, the sides of the vertex 

 with dense, long, fine pile ; the anterior portion of the 

 ocellarium has similar pile and on its posterior half 

 it has 3 or 4 pairs of long, slender, distinct bristles. 

 Anterior eye facets strongly enlarged. 



Thorax : The thorax is pollinose, the mesonotum with 

 abundant, long, bristly but slender pile ; acrostical and 

 anterior dorsocentral pile is not differentiated. On the 

 posterior half is a band of slender, long, dorsocentral 

 bristles; humerus pilose only. Lateral bristles pres- 

 ent as follows: 3 stout notopleural, 3 or 4 weak su- 

 praalar, a like number of postalar, the scutellum with 

 5 or 6 pairs of long, slender bristles, and its disc densely 

 long pilose. The metapleuron has a wide, vertical band 

 of long, attenuate, apically twisted, slender bristles. 

 Propleuron, posterior and dorsal mesopleuron with 

 abundant, long, quite fine pile. A small, similar tuft 

 of pile on the upper sternopleuron ; the metasternum 



with long pile; postmetacoxal area membranous 

 Prosternum dissociated. 



Legs : The legs are stout without being at all swollen, 

 but not as stout as hi Comantella. All the femora, 

 especially the hind pair with unusually dense, long, 

 fine pile. On the hind femur the pile is especially long 

 towards the base; its dorsomedial pile is short and 

 appressed. Anterior femur with rather long, posterior 

 pile. Bristles absent on all the femora. Ventral and 

 posterior pile of the tibiae is long and exceptionally 

 fine at the apices of the hairs. Tibial bristles prom- 

 inent, long, attenuate, basally stout. Hind tibia with 

 anterior and dorsal rows, each with 5 elements and 4 

 or 5 ventral bristles; a similar number is present on 

 the remaining tibiae. Anterior tibia with at least pos- 

 terior rows of bristles, a posterodorsal row, and 7 or 8 

 short anterodorsal bristles. Protibial apex with only 

 ordinary, stout bristles and no spine. Claws slender, 

 sharp, strongly curved from the middle. The pulvilli 

 well developed, empodium swollen at the base. 



"Wings: The marginal cell is widely open; second 

 submarginal cell long and slender, fork of the third 

 vein opposite or slightly before the posterior crossvein. 

 All posterior cells widely open. Anal cell narrowly 

 open or closed. Alula short; ambient vein complete. 

 Veins often tinged with gray or black and furcations 

 or cross veins with a bluish spot. 



Abdomen: The abdomen is at least as wide as the 

 mesonotum and with long, fine, abundant pile nar- 

 rowly restricted to the lateral margins except in males, 

 where it is apt to extend over at least the lateral third 

 of each tergite. Medial pile short, scanty, subap- 

 pressed, generally fine, but sometimes setate on the basal 

 half of the female abdomen. Males with seven well 

 developed tergites and a short liplike eighth tergite. 

 Females with eight tergites, the last tergites are long 

 and well developed. Male terminalia rather short and 

 inconspicuous, rotate from one-fourth to one-half; the 

 epandrium is cleft to the base and narrowly separated 

 but each half is triangular and short. Gonopod also 

 triangular, of about the same size as each half of the 

 epandrium. The hypandrium is wide and rather long, 

 more or less flattened and convex around the edges 

 and leaving the cavity of the terminalia largely ex- 

 posed. The female terminalia bear 5 or 6 long, stout, 

 apically blunt, spoonlike spines on each acanthophorite. 



Distribution: Nearctic: Eucyrtopogon albibarbis 

 Curran (1923) ; calcarata Curran (1923) ; comantis 

 Curran (1923) ; diver sipilos is Curran (1923) ; kelloggi 

 Wilcox (1936); maculosus Coquillett (1904); nebulo 

 Osten Sacken (1877) ; nigripes Jones (1907) ; puncti- 

 pennis Melander (1923); spinigera Curran (1923); 

 varipennis Coquillett (1904). 



Sintoria, new genus 



Type of genus : Sintoria emeralda, new species. 



Small flies of moderately stout abdomen and stout 

 legs. The mesonotum is rather distinctly arched both 

 anteriorly and posteriorly and bears only dense, long, 



