ROBBER FLIES OF THE WORLD 



573 



bristle just beyond the middle, 1 weak bristle at the 

 apex anterioriy and posteriorly, 1 stout, long bristle 

 anteroventrally near the middle; middle tibia with 2 

 dorsal bristles, 2 anterior, 3 posteroventral, and 2 an- 

 teroventral. Anterior femur with 1 bristle only, an- 

 teriorly at the apex. Anterior tibia with 3 short dorsal, 

 2 or 3 short basal anterodorsal, and 2 exceptionally 

 long, stout, posteroventral bristles. Basitarsus as long 

 as the next two segments. All tarsi end in sharp, slen- 

 der claws, long pulvilli and slender, bladelike em- 

 podium. 



Wings: The marginal cell closed, the subcosta of 

 moderate width ; the anterior branch of the third vein 

 is gently sinuous and ends shortly before the wing 

 apex; the posterior branch ends shortly behind the 

 wing apex. The second submarginal cell slightly nar- 

 rowed at the outer fourth, slightly widened towards the 

 base. First posterior cell and the second both widely 

 open; base of second posterior cell only moderately 

 swollen anteriorly ; fourth posterior closed with a long 

 stalk and slightly convex anteriorly and distally; the 

 second basal cell ends in two veins ; alula large, ambient 

 vein complete. 



Abdomen : The abdomen is not quite as wide as the 

 mesonotum, cylindrical, and but little tapered, except 

 that the last two or three segments of the male are 

 slightly tapered; the sixth segment of the female is 

 slightly tapered, the seventh segment more strongly 

 tapered. The pile of the abdomen is appressed and 

 setate, a little longer laterally on the sides of the first 

 three tergites. First tergite laterally with 4 or 5 pairs 

 of slender, weak bristles along the lateral postmargins. 

 First stemite without pile; remaining sternites with 

 only long, stiff, slender, bristly hairs ; the eighth ster- 

 nite is rather long and transverse apically, with a me- 

 dial, posterior, obtuse, triangular patch of membrane. 

 There are eight tergites in the male, the seventh is two- 

 thirds as long as the sixth ; the eighth is a fourth to a 

 fifth as long as the seventh, slightly longer laterally. 

 Female with seven tergites, the seventh approximately 

 as long as the sixth. Male terminalia not rotate but 

 rather large ; the superior forceps long, apposed medi- 

 ally, curved toward the midline and also curved a little 

 downward and pointed apically. The gonopod is half 

 as long as the superior forceps and turned up at the 

 apex. The proctiger lies almost completely between 

 the forceps. Tlie hypandrium is short but present, 

 cavity entirely open below. Female ovipositor com- 

 paratively short and very strongly flattened or com- 

 pressed latei'ally on the eighth and remaining tergites. 



Distribution: Nearctic: Epitriptus erythocnemms 

 Hine (1909). 



Neotropical : Epitriptus alhisetosus Wulp ( 1882) ; 

 falhospinosus Bellardi (1861) ; niveibarbus Bellardi 

 (1861). 



Palaearctic: Epitriptus arthriticus Zeller (1840); 

 cingulatus Fabricius (1781) {=annulatus Macquart 

 (1826), maculosus Harris (1782), striatus Meigen 

 (1820)]; cowini Hobby (1940); elkantarae Becker 

 (1907) ; emarginatus Loew (1949) ; farinosus Becker 



in Becker and Stein (1913) ; inconstans Wiedemann in 

 Meigen (1820) [=cuUciformis Pallas in Wiedemann 

 (1818), m?(?ro;?y^a Becker in Becker and Stein (1913)] ; 

 major Becker (1907); maximus Schiner (1868); 

 ?micam Meigen (1820) ; mixtus Becker (1908) ; seto- 

 sulus Zeller (1840) [ = nanus Loew (1840), striatus 

 Macquart (1826) not Meigen] ; soZoa? Enderlein (1934) ; 

 fstriatus Meigen (1820) ; syria/ms Schiner (1867) ; 

 <^6^aZ^s Villeneuve (1911). 



Melin (1923) describes larva and pupa of Epitriptus 

 cingulatus. 



Dinozabrus, new genus 

 FiGUBES 364, 735, 1529, 1538, 2253, 2259, 2439, 2447 



Type of genus : Dinozabrus bicolor, new species. 



Kather short, robust species with narrow face. The 

 vertex is especially narrow. Face gibbous and abrupt 

 dorsally, the elevation extending over the lower three- 

 fourths and with numerous, long, stout, slender bristles. 

 Length 18 mm. 



Head, lateral aspect: The face is strongly gibbous, 

 leaving the upper fourth nearly plane with the eye. 

 The eye is unusually long, extremely convex anteriorly 

 and plane posteriorly through the middle third or less 

 and strongly recessive anteroventrally on more than 

 the lower third. The occiput is moderately thick 

 throughout, more prominent below as a consequence 

 of the eye recession. Pile of occiput rather dense and 

 long ventrally becoming scanty and shorter in the 

 middle and completely replaced by bristles dorsally. 

 The occipital bristles are stout; they begin at the 

 middle of the head, where there are 9 pairs curved 

 downward, followed by 11 dorsal pairs, nearly straight, 

 and stouter. The proboscis is rather short, moderately 

 thick, subcylindrical and at most very slightly swollen 

 on the basal third. The ajsex is bluntly rounded with 

 a few, fine haire, a dorsal ridge is absent; the basal 

 half below and also ventrally laterally bears numerous, 

 extremely long, stiff hairs. The proboscis is directed 

 obliquely forward and chiefly downward. The palpus 

 is stout, with stiff, apical bristles and bristly pile ven- 

 trally and laterally. The antenna is attached a little 

 above the middle of the head, moderately elongate and 

 rather slender; the first segment is a little longer than 

 the second. The third segment is as long as the first 

 two segments combined, with a rather long, distinct 

 microsegment directed downward and a comparatively 

 short style, as long as the third segment; style dis- 

 tinctly spatulate apically and carrying a spine. First 

 segment of antenna with unusually numerous, long 

 bristles to bristly haii-s ventrally and laterally with 

 shorter ones dorsally. Second segnient with long setae 

 ventrally and dorsally. 



Head, anterior aspect: The face below the antenna 

 is about a fifth the head width and expanded. Sub- 

 epistomal area rather large, concave, pubescent and ob- 

 lique. Face micropubescent, apilose but bearing quite 

 numerous, long, moderately stout, curved, black bristles, 



