534 



UNITED STATES NATIONAL MUSEXTM BULLETIN 224 



mesonotum is rather high and slightly compressed 

 laterally, with a special tendency in this direction an- 

 teriorly; the anterior margin is somewhat abrupt and 

 strongly curved or convex. The lateral bristles are 

 strong and consist of 2 very strong, long, brownish 

 yellow notopleural, 1 similar supraalar placed high and 

 directly above wing base, 2 postalar, 6 or 7 quite long, 

 stout, postdorsocentral bristles arched backward, be- 

 ginning at the middle of the mesonotum, and 1 pair of 

 long stout, divergent scutellar bristles directed upward. 

 Scutellar disc with rather numerous, moderately long, 

 proclinate yellow hairs. Pleuron without bristles, ex- 

 cept a single vertical row of 7 on the metapleuron ; the 

 lowermost 3 are strong. The pronotum has only pile. 

 Whole pleuron brownish yellow poUinose ; mesopleuron 

 with 6 fine, long hairs posteroventrally, upper sterno- 

 pleuron with 7 or 8 bristles ; pteropleuron with 2 short, 

 fine hairs. Hypopleuron with 5 long, fine hairs; 

 metanotal slope bullose, only slightly creased medially, 

 without pile and pubescent only ; squamal fringe long. 

 Metasternum laterally with 2 or 3 hairs ; postmetacoxal 

 area membranous. 



Legs : The hind femur is only moderately tliick, dense- 

 ly appressed, short pilose; the dorsal pile is black 

 except at base. The subapex bears a pair of strong, 

 dorsal, black bristles ; at the apex dorsomedially is an- 

 other bristle. Dorsomedial margin at the base and the 

 ventromedial margin at the base with some long, fine, 

 yellow hairs, and a transverse pair of rather strong, 

 brownish yellow bristles at the basal fifth ventrally. 

 Hind tibia slender, with appressed, fine, black setae 

 laterally to the dorsal middle. Medial surface with a 

 brassy yellow mat reaching almost to the base. This 

 tibia has 2 black, strongly oblique, ventral bristles at 

 middle and outer fourth, 4 dorsal bristles, 2 of them 

 quite basal, 1 in the middle, 1 at the outer fourth ; apex 

 with 2 very strong ventral, 1 lateral, 1 dorsal, and 1 

 medial bristle. Middle femur with 2 strong, yellow 

 bristles anteriorly near the middle, 1 at the apex pos- 

 teriorly. The middle tibia with 3 rather long, brassy 

 yellow, posteroventral bristles, 2 black, strong, oblique, 

 ventral bristles at the middle and outer fourth; also 

 there are 2 or 3 short dorsal bristles, the weak outer 2 

 elements doubled. Otherwise these tibiae bear ap- 

 pressed, black setate pile, yellow posteriorly. Anterior 

 femur with 2 or 3 quite short, weak bristles anteriorly 

 and a similar bristle dorsally at the outer fifth. On the 

 anterior tibia are 3 quite long, strong, brassy yellow, 

 posteroventral bristles; its apical bristles are black and 

 exceptionally strong, and long ventrally and anteriorly ; 

 in addition it has 3 rather weak, short, dorsal, black 

 bristles. Basitarsus short, with very long, stout, black 

 bristles directed posteriorly at base and apex ; the an- 

 terior bristles are shorter. Claws long, sharp, strongly 

 bent at the apex; pulvilli thin, subtruncate apically 

 reaching to the inner end of claw ; empodium long, stout 

 at the base. 



Wings : The marginal and submarginal cells, and to 

 a less extent the whole wing, are rippled ; anterior mar- 



gin not expanded. The anterior crossvein is moderately 

 oblique. The second submarginal cell takes origin be- 

 yond the end of the discal cell. If this fly is related to 

 the Neolophonotus Engel complex it is separable from 

 the several Ethiopian genera by the wavy, sinuous, 

 second branch of the third vein. Base of second pos- 

 terior cell scarcely or at most very gradually swollen 

 and expanded. The second basal cell ends in two 

 veins. Fourth posterior cell closed and stalked, con- 

 vex on all sides. Alula large, ambient vein complete. 



Abdomen : The abdomen is cylindrical and tapered, 

 only the first and second tergites are slightly flattened 

 in the middle. The first tergite is a tliird as long as the 

 second; it bears scanty, yellow pile laterally and 5 

 rather stout, moderately long, yellow bristles. The sub- 

 posterior margin laterally on the remaining tergites has 

 1 or more moderately stout, j^ellow bristles ; on the sec- 

 ond tergite these bristles number 5, with the medial 2 

 much longer and stronger; third tergite with 6 or 7 

 bristles; fourth tergite with two, fifth to seventh ter- 

 gites with 1 bristle each. Males with 8 tergites ; females 

 with 7 tergites visible. Male terminalia large but un- 

 usually short. The superior forceps are expanded dis- 

 tally but quite obtuse; the proctiger is concealed be- 

 tween. Gonopod about half as long as superior forceps, 

 appressed between the upper forceps and the large, 

 greatly extended eighth stemite. The female ovipositor 

 is slightly longer than the last two tergites, strongly 

 compressed laterally; it begins to be compressed only 

 at the middle of the eighth segment ; the stemites bear 

 a number of moderately stout, rather long, yellow bris- 

 tles placed irregularly in the middle. The second ster- 

 nite has 7 or 8 bristles, the third has 10 or 12, the re- 

 maining stemites with fewer bristles. 



Distribution: Neotropical: Labromyia alhiiarhis, 

 new species. 



Labromyia albibarbis, new species 



Length 14 mm. Male, female. Head : The head is 

 black with white mystax, and the general appearance 

 of the flies brownish black. 



Thorax: The anterior mesonotum has the color 

 rather sharply demarcated, but not quite extending to 

 the humerus; the humerus and its postmedial border 

 is brownish yellow ; the black of the mesonotum is con- 

 tinued as submedial stripes posteriorly. Whole pleuron 

 is pale, brownish yellow pollinose. Knob of halteres is 

 red. Scutellum pale greyish to brownish yellow pol- 

 linose. 



Legs: Hind femur distinctly black, except at the 

 apex, which is brownish orange. Anterior 4 femora 

 more extensively brownish orange but chiefly black. 

 Coxae and trochanters largely black. All tibiae of a 

 light, yellowish brown, the apices diffusely and narrow- 

 ly dark, reddish brown. All basitarsi, except the ex- 

 treme apex and a small part of the succeeding two seg- 

 ments, yellowish to reddish brown. 



Wings : The wings are hyaline. 



Abdomen : The abdomen is black, brownish to grey- 

 ish yellow pollinose and, excepting the postmargins. 



