150 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



Wings : The wings are immaculate except for mar- 

 ginal and apical villi ; marginal cell open though nar- 

 rowly, subinarginal cell also open narrowly, but a little 

 more widely. The anterior branch of the third vein 

 arises rectangularly ; the posterior branch ends behind 

 the wing apex. All posterior cells widely open except 

 the fourth which is closed and stalked, the stalk usually 

 long, its end vein usually aligned with the lower end 

 vein of the discal cell, but sometimes makes a broad 

 angle. Anal cell closed; alula large, protruded dis- 

 tally ; ambient vein complete, but often weak and the 

 wing margin frequently frayed. 



Abdomen : The abdomen is stout at the base, distinctly 

 tapered to the apex, long and extending beyond the 

 wings; the pile is abundant, subappressed, coarsely 

 setate, a little longer on the lateral margins. The first 

 tergite has a long row of lateral bristles which may 

 contain 12 to 14 or fewer. Males with seven tergites 

 and a liplike trace of the eighth ; eighth sternite short. 

 Females with eight tergites, the eighth at least half as 

 long as the seventh or longer. Male terminalia not 

 rotate, the epandrium cleft into superior forceps. Gon- 

 opod large but generally shorter; it is extended inward 

 medially toward the base; in the middle it is fused with 

 the base of the more or less triangular hypandriuin. 

 Genital cavity exposed; both superior forceps and 

 gonopod distally are apt to bear intricate, distinctive 

 processes and teeth. Females with 6 or 7 pairs of 

 spatulate spines on the acanthophorites. 



Distribution: Neotropical: Bathypogon einereus 

 Bigot (1878) ; claripennis Schiner (1868) ; hirtuosus 

 Schiner (1868) ; parvus Bigot (1S78). 



Australian: Bathypogon asiliformis Loew (1851); 

 aoris Walker (1849) ; boebius Walker (1849) ; brachy- 

 pterus Macquart (1838) ; fulvus Hull (1956) ; griseus 

 Hull (1956) ; hamaturus Hull (1956) ; maculipes Bigot 

 (1878); m.agnus Hull (1956); mutilatus Walker 

 (1855) ; nigrachaetus Hull (1956) ; nigrinus Eicardo 

 (1912) ; pedanus Walker (1849) ; ?plumbeus Fabricius 

 (1775) ; posticus Walker (1855) ; robustus Hull (1956) ; 

 rubellus Hull (1956) ; rubidapex Hull (1956) ; testaceo- 

 vittatus Macquart (1855); tristis White (1914); un- 

 cinatus Hull (1956). 



Crvolestes, new subgenus 

 Figures 512, 1019, 1028 



Type of subgenus : Bathypogon hirtuosus Schiner, 

 1868. 



Comparatively large flies with short head and dis- 

 tinguished by the lower facial protuberance, which 

 bears numerous, long, slender bristles and bristly hairs. 

 The occiput is without bristles but bears abundant, long 

 pile. The antenna is suggestive of Cyrtopogon Loew in 

 its appearance. The wing venation approaches Bathy- 

 pogon Loew, but the second subinarginal cell is much 

 more narrow and the anal cell is open. These flies 

 differ also in the absence of bristles on the occiput but 



the presence of very stout, long bristles beneath the 

 second antenna! segment. Length 18 to 22 mm. 



Head, lateral aspect: The head is high and short. 

 The face is quite short on the upper two-fifths but 

 prominent and protuberant below. The occiput is 

 prominent and well developed below becoming pro- 

 gressively reduced towards the vertex; it bears dense, 

 conspicuous, long pile, the dorsal elements in the ver- 

 tical legion not much shorter and the more external 

 hairs only stiffened; bristles are absent. The proboscis 

 is stout, directed obliquely downward, projects consid- 

 erably beyond the face and its thickness is reduced only 

 quite near the apex. The apex is bluntly pointed and 

 bears numerous, bristly hairs dorsally and again on the 

 vertical margin but confined to the outer fourth. Pal- 

 pus of two segments; the first segment is excavated, 

 the second short, clavate, attenuate with apical pore, 

 and both bear numerous, long, stiff hairs. The antenna 

 is attached a little above the middle of the head, its 

 length a little greater than the head length. The first 

 two segments are of nearly equal length, the first more 

 robust, with numerous, long, stiff hairs on all sides ex- 

 cept medially, the second with 4 dorsal bristles and 3 

 still longer, more stout bristles below. Third segment 

 elongate, a little narrowed basally, or subbasally, the 

 apex obliquely truncate downward and carrying a 

 short, robust, minute spine-tipped microsegment. 



Head, anterior aspect: The face below antenna is 

 almost one-fourth the head width, scarcely divergent 

 below. The upper part is without pile; the gibbous or 

 protuberant lower part bears very numerous, long, 

 slender bristles or bristly hairs, with some equally long, 

 more slender hairs. Front a little wider than upper 

 face, the vertex again convergent. Sides of front with 

 numerous, long, stiff hairs. Vertex rather sti'ongly ex- 

 cavated, the sides of the ocellarium slanting, and the 

 latter bears laterally 4 pairs of long, slender, black 

 bristles, slightly curved backward and divergent. An- 

 terior eye facets strongly enlarged. 



Thorax: The mesonotiun moderately convex and 

 strongly abrupt in front, gently compressed between 

 the humeri and with steeply sloping sides. The acros- 

 tical pile is long, slender, nearly erect, backwardly 

 curved and bristly, forming a double row over most of 

 the middle anterior mesonotum but widening into a 

 broad, dense patch along the steep anterior portion of 

 the mesonotum. Dorsocentral elements also are quite 

 long and fine. All the pleural pile and much of the 

 femoral and abdominal pile microscopically crinkled. 

 All bristles of mesonotum black, extremely long, and 

 very stout ; they consist of 3 notopleural, 3 supraalar, 5 

 postalar and 7 pairs on the scutellum, the 2 more basal 

 pairs weak. The postdorsocentral elements are excep- 

 tionally long and stout ; there is a double row on each 

 side containing 12 to 14 prescutellar bristles. Metanotal 

 slopes pubescent only ; metapleuron with a wide, middle 

 vertical band of long, fine pile and 9 rather stout, 

 brownish yellow bristles. Pronotum densely long, fine 

 pilose; bristles absent. The propleuron, the anterior 

 and posterior mesopleuron, upper sternopleuron, hypo- 



