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tnsriTED STATES NATIONAL MUSEUM BULLETIN 224 



stout elements as well. The lower half of the gibbosity 

 has very numerous, stout bristles, often spikelike; 

 sometimes there may be slender elements aa well, any 

 of which may be continued along the sides of the epis- 

 toma. The front is sunken and concave, pollinose or 

 nearly bare, with a few, ocular bristles and a subocular 

 tuft of bristly hairs on the lower lateral front. The 

 front is slightly divergent, the vertex slightly nar- 

 rowed, deeply excavated. Instead of bristles the broad, 

 low ocellarium usually bears abundant, coarse pile or 

 a few bristly hairs, especially behind the ocelli. Eye 

 facets centrally enlarged, the facets often appearing 

 flattened and rather waxy. 



Thorax: The mesonotum is broad, long and rather 

 low ocellarium usually bears abundant, coarse pile or 

 vnidifferentiated, except that there may be 2 or 3 pairs 

 of stout, postdorsocentral bristles. Humerus with sim- 

 ilar, stiff pile. The lateral complement of stout bristles 

 consists of 3 notopleural, 3 or 4 supraalar, 1 or 2 post- 

 supraalar, and 2 or 3 postalar bristles. The convex, 

 ventrally riimned scutelkun is without bristles but bears 

 very numerous, long, bristly hairs on rim and disc. 

 Jiletanotal callosity bullose, pollinose and without pile 

 or bristles. Propleural pile situated in dense, long 

 tufts. Upper mesopleural pile dense. The posterior 

 basalare has a dense tuft of slender bristles or bristly 

 pile, which is conspicuous; anterior basalare pollinose 

 only. Posthypopleuron and metapleuron with a broad, 

 vertical band of numerous bristles and long bristly 

 hairs. Pteropleuron and sternopleuron pilose. Post- 

 metacoxal area membranous. Prostemum dissociated. 



Legs: The femora and tibiae are uniformly stout 

 and robust; the hind tibia is especially likely to be 

 thickened; the hind basitarsus enlarged and swollen. 

 All basitarsi and tarsal segments are notably and 

 characteristically shortened. The pile of the legs is 

 characteristically dense, especially on the tibia but in 

 a few species it tends to be a little shorter and more 

 tliinned on the first 4 tibiae and on the basal portion of 

 the liind femur. All bristles are very stout and sharp, 

 sometimes well obscured by pile in the more densely 

 pilose species. On a typical species the hind femur 

 may have 7 or 8 lateral bristles, 10 to 12 ventrolateral 

 bristles, and 3 or 4 dorsal and dorsomedial bristles near 

 the apex. The middle femur bears 2 to 4 prominent 

 bristles anteriorly on the outer half, 1 or 2 correspond- 

 ingly on the posterior half, and 2 bristles posterodorsal- 

 ly near the apex. Anterior femur with 1 bristle an- 

 teriorly on the outer fourth and 1 to 4 near the apex in 

 a vertical row ; sometimes there are 2 or 3 bristles pos- 

 teriorly at the apex. Claws remarkably stout and blunt 

 at apex ; the pulvilli and empodiiun large. 



Wings : The wings are broad at base, elongate, always 

 longer than the abdomen and tending to be a little 

 pointed at apex. The marginal cell is often with a 

 very short stalk or is even closed at the margm. Three 

 submarginal cells are present; of tliese the third and 

 basal half of the second are quite narrow and the sec- 

 ond submarginal cell is strongly flared. The anterior 

 branch of the third vein ends well above the wing apex 



and the posterior branch ends far behind. Posterior 

 crossvein sometimes extremely short. Fourth cell and 

 anal cell closed and stalked. Ambient vein complete ; 

 alula large. 



Abdomen: The abdomen is short and robust and 

 nearly or quite as wide as the thorax. The pile is long, 

 especially long and tufted on the sides of the first, the 

 posterior half of the second, the whole of the third 

 and fourth and sometimes also of the remaining seg- 

 ments. The pile tends to be long, dense, coarse and 

 matted. Bristles are restricted to the sides of the fii'st 

 tergite. The pile on parts of these flies is often con- 

 trastingly colored. Sternites with long, dense pile. 

 Females with eight well developed tergites. Males 

 with the eighth tergite generally visible only laterally 

 and usually short. Male terminalia comparatively 

 small and never large ; the superior forceps present and 

 elongate. The gonopod is shorter, the hypandrium 

 present but reduced in length ; the aedeagus smiple and 

 the terminal ia are not rotate. Female terminalia short ; 

 the eighth tergite and stemite are relatively short and 

 both are a little compressed laterally ; the ninth tergite 

 is cleft on the apical half but short and small, wider 

 than long ; the dorsal proctiger is laterally compressed 

 and apposed. 



Mallophora constitutes a large and characteristic ele- 

 ment of the Neotropical Asilid fauna with a few species 

 found in the Nearctic region. They are restricted to 

 the New World. 



Distribution: Nearctic: MaUo'pTiora acra Curran 

 (1931) ; ardens Macquart (1834) ; homhoides Wiede- 

 mann (1821) ; hromleyi Curran (1930) ; chrysoTuela 

 Bromley (1925) ; claiisicella Macquart (1849) ; fautri- 

 coides Curran (1930) ; frustra Pritchard (1935) ; fulva 

 Banks (1911) ; fulviventris Macquart (1849) ; gulldiana 

 Williston (1885); intermedia Tucker (1907); la- 

 phroides Wiedemann (1828) [ = heteroptera Macquart 

 (1838), m.inuta Macquart (1834)]; megachile Coquil- 

 lett (1893) ; nigraWiWiston (1885) ; orcma Wiedemann 

 (1828) ; perpusiUa Walker (1851) ; prudens Pritchard 

 (1935) ; pwZcAra Pritchard (1935) ; rex Bromley (1925). 



Neotropical: Mallophora abana Curran (1934) ; ada 

 Curran (1941) ; aeaca Williston (1901) ; a^ffinh Schiner 

 (1868) ; ajax Curran (1941) ; alhicincta Bromley 

 (1929) ; alhifrons Walker (1950) ; alecto Rondani 

 (1848) ; anticaCwYVim (1934) ; antiqua^KWev (1855) ; 

 aria Curran (1941) ; argentlpes Macquart (1838) ; atra 

 Macquart (1834) ; auromystaceaM.a.c(\\\tivt (1855) ; har- 

 hipes Wiedemann (1819) ; hassleri Curran (1941) ; hel- 

 zehulSohmQv (1867) ; higotii'Ljwch. Avv\h'A\za.gvi (1882) 

 \^ = soccata Lynch Arribalzaga (1880) not Thomson]; 

 breviveTitris Macquart (1849) ; hnmerl Bromley 

 (1929) ; calida Fabricius (1787) ; campestris Curran 

 (1941) ; canc?fn5 Walker (1851) ;CT7?'ate Walker (1851) ; 

 cilicrura Rondani (1850) ; cinerascens Walker (1855) ; 

 clavipes Curran (1941) ; clavitarsis Curran (1941) ; co- 

 endeiventris Thomson (1869) ; contraria Walker 

 (1851) ; copelloi Gemignani (1930) ; cora Curran 

 (1941); craverii Bellardi (1861); cruralis Rondani 

 (1863) ; curiosa Curran (1941) ; dallasi Gemignani 



