466 



UNITED STATES NATIONAL MUSEUM BULLETIN 2 24 



doi-sally. Anterior femur with numerous, fine, long 

 hairs ventrally and with considerable fine, long pile 

 dorsally. Anterior tibia with a stout anterodoi-sal at 

 the base, 7 stout, short, posterodorsal, 2 long, postero- 

 ventral bristles on the outer half and abundant, long, 

 fine pile ventrally. Anterior basitarsus only 11/2 times 

 as long as the second segment ; all tai-sal segments short. 

 Claws slender, bluntly pointed; pul villi long and the 

 empodium long. 



Wings : The venation similar to Promachus. 



Abdomen: Pile of abdomen long and dense on the 

 sides of the first three tergites and long across the mid- 

 dles of the first two tergites ; it is especially dense and 

 tufted laterally on the first tergite where there are also 

 2 or 3 slender, pale bristles; posterolateral margins of 

 the second, third and fourth tergites with a row of very 

 slender bristles or bristly hairs and with stiff pile simi- 

 larly placed on the remaining tergites; first sternite 

 apilose, the second to the fourth with abmidant, long, 

 fine pile. Ovipositor short, the eighth segment as long 

 as the seventh, the whole ovipositor strongly cylindroid 

 and as wide as high. Ninth and tenth segments both 

 short; the ninth is strongly slanted downward dorsally. 



Two species fall into this subgenus, PhiIo?7iachus hy- 

 poleucochaetus and vagator. 



Subgenus Trypanoides Becker 



Figures 312, 730, 1382, 1391, 2193, 2212 



Trypanoides Becker, Ent. Mitt., vol. 14, p. 71, 1925. Type of 

 subgenus : Trupanea testaceipes Macquart, 1855. Designated 

 by Engel, 1926. 



Large flies principally distinguished by the extensive 

 ovipositor in the females which incorporate the last 5 

 segments of the abdomen, leaving only the first 5 with 

 the abdomen proper. The terminal segments tend to 

 be lengthened, slender, attenuate and of progressively 

 dimmished size. Length 20 to 35 nun. 



Head: The face is plane or extended into a short, 

 plane gibbosity. Generally witli long, stout bristles 

 on the lower half of the face and the subepistomal mar- 

 gin, and long, coarse pile on the upper half of the face. 

 The third antemial segment is often attenuate from 

 the base instead of oval. The style is long, pointed 

 and only slightly thickened at apex. The vertex is 

 deeply excavated, the ocellarium without interocellar 

 pile and bristles. 



Thorax : The mesonotum and scutellum with strong 

 bristles and with acrostical setae more or less dif- 

 ferentiated. 



Legs: Tlie legs have numerous, stout bristles. 



Wings : The wings are of moderate length, the anal 

 lobe only slightly protrusive at its apex. Ambient vein 

 complete. 



Abdomen : The abdomen presents an imusually short, 

 robust form, and in females accentuated by the long, 

 rather slender ovipositor which incorporates at least 

 five segments. Some of the males in North American 



species have the tufts of silvery hairs dorsally upon 

 the superior forceps as in genus Promachus sensu stricto 

 and emphasizes the closeness of these two groups, which 

 can be separated only by an overlapping female char- 

 acter. The definition of this subgenus is here drawn 

 largely from Old World species like Trypanoides yer- 

 huriensis. Of the American species known to me, 

 Trypanoides rufipes, vertehratus, and hastardii fall in- 

 to this subgenus. As far as known to me the Old 

 World species which fall into this subgenus are Try- 

 jmnoides fulviventris, ijidigenus, nigribarhatus, testa- 

 ceipes and yeriuriensis. 



Genus Promachina Bromley 



FiGiTEES 346, 744, 1383, 1392, 2190, 2213 



Promachina Bromley, Ann. Ent. Soc. Amer., vol. 27, p. 96, 1934. 

 Type of genus : Promachus trapezoidalis BeUardi, 1861, by 

 original designation. 



These are generally smaller than the species of 

 Promachus Loew and they are robust, with the male 

 terminalia and female ovipositor nearly like Trypano- 

 ides Becker, subgenus, but they are distinguished by the 

 blunt claws with cuplike apex which allies them to Mal- 

 lophora Macquart. Length 15 to 25 mm. 



Head, lateral aspect : The face is plane or with the 

 lower half barely raised or slightly elevated. LTpper 

 occipital bristles strongly developed. The proboscis 

 is stout and someWhat swollen on the basal half, with- 

 out dorsal ridge and the subapex bears a transverse 

 crease beyond which there is apical pile. Palpus com- 

 paratively small and short with many stout dorsal 

 bristles. The third antennal segment is slender and 

 unusually elongate; the style is of moderate length, 

 only slightly thickened at the apex and blunty pointed. 



Head, anterior aspect: The face is unusually narrow 

 and below the antenna it is scarcely a seventh the head 

 width ; it is strongly divergent below. The lower half 

 and the sides below the subepistoma bear numerous, 

 long, quite slender bristles or bristly hairs; the upper 

 half of face has fewer but similar elements and over 

 the whole face the lateral margins tend to lack pile or 

 bristles; whole face surface densely micropubescent. 

 Front pollinose with a dense patch of bristles on each 

 side immediately above the antenna and on the upper 

 front a single row beside the eye, which is continued 

 over the vertex. The vertex is not wider than the upper 

 face and rather deeply excavated especially pos- 

 teriorly; the ocellarium is pi'ominent with 1 or 2 hairs 

 between the ocelli and a row of other hairs behind. 



Thorax : The mesonotal bristles are quite strong and 

 stout and typical, with well developed, short, curved 

 acrostical bristles. Scutellar marginal bristles long, 

 numerous but quite, slender. The middle of the disc, 

 however, bears 1 to several pairs of bristles as stout 

 as those of the mesonotum. On the pleuron the prono- 

 tum has stout bristles. Only the upper and posterior 

 margins of the mesoiDleuron with pile. Pteropleuron 



