520 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



The Tenation is similar but there is no spur vein at the 

 base of the second submarginal cell. The male termi- 

 nalia are rather similar; there is no ventral protuber- 

 ance from the eighth sternite. Female terminalia rather 

 like Neolophonotus Engel; the ninth and tenth seg- 

 ments are quite high, with the ninth compressed only on 

 the posterior half; female terminalia quite like La- 

 hromyia Hull, but differing sharply in the character of 

 the face and of the second submarginal cell. Length 16 

 mm. 



Head, lateral aspect: The face is only moderately 

 produced as a low, moundlike gibbosity on the lower 

 half of the face, leaving the upper half plane with the 

 eye; the antenna arises from a low, brief elevation. 

 The subepistoma is large and high, and strongly ob- 

 lique ; as a result the upper angle of the facial protuber- 

 ance is about the same as the lower angle. The occiput 

 is short but prominent near the vertex; it is poorly 

 developed below; the cheeks are extensive. Bristles 

 are confined to the dorsal half of the occiput and con- 

 sist of 10 to 12 stout, yellowish elements; the lower- 

 most bristles are larger and strongly turned downward. 

 The occipital pile is long, fine and yellow, but rather 

 scanty. The proboscis is robust, blimtly pointed, with 

 stiff pile above and below at the apex, a tuft of long 

 pile in the middle ventrally and long, fine hairs ven- 

 trally again at the base. The palpus is small, quite slen- 

 der and cylindi'ical and bears quite long hairs which at 

 the apex are a little more stiffened. The antemia is 

 attached at a point just above the middle of the eye 

 and, style excepted, is distinctly shorter than the head. 

 The first two segments are stout, and the first segment 

 is nearly twice as long as the second; both bear long 

 setae above and below. The third segment is barely 

 longer than the first segment, or not longer; it is a 

 little more narrow, tapered apically, bears a distinct, 

 short microsegment, and a long, rather stout style; the 

 style is longer than the second and third antemial seg- 

 ments. 



Head, anterior aspect: The head is nearly circidar. 

 The face beneath the antenna is more than a fifth and 

 less than a fourth of the head width; it is slightly 

 widened below. The face is densely, brownish yellow 

 pollinose. The upper, plane poi-tion is without pile 

 and the entire upper half of the facial elevation bears 

 only 1 pair of fine, long hairs. The lower half of the 

 elevation bears, across the epistoma, transversely, at 

 the highest point, a row of quite long and exceptionally 

 stout bristles, which is composed of 5 pairs with 3 other 

 equally stout, long bristles situated medially above this 

 row; lateral margins of subepistoma with fine, long 

 hairs which are shorter; all bristles of the mystax 

 brownish yellow except a gi-oup of 4 hairs in the middle 

 below. The front is small ; it bears an ocular row of 7 

 long, curled setae or bristly hairs, and a subocular row 

 of 5 slightly longer bristly hairs. Vertex rather deeply 

 excavated with steeply slanted sides; ocellarium small 

 and low, with on each side 3 or 4 short, minute, black 

 bristles. Anterior eye facets strongly enlarged with a 

 sharp, impressed line of division. 



Thorax: The mesonotuin is moderately high and 

 equally convex anteriorly and posteriorly. It bears a 

 double row of acrostical elements anteriorly, without a 

 bare stripe submedially; the whole remaining area is 

 sparsely short, black setate, the setae nearly erect. Hu- 

 merus with 18 similarly short setae. All lateral meso- 

 notal bristles are black, long and stout and consist of : 

 2 notopleural, 1 supraalar located quite posteriorly, 1 

 still longer postalar bristle but no scutellar bristles. 

 The scutellum is densely pale, ochre pollinose. Disc 

 of scutellum with about 40 to 50 short, erect, yellow 

 setae. Lateral metasternum with some long hairs ; post- 

 metacoxal area membranous. 



Legs : The hind femur distinctly and slightly thick- 

 ened through the middle, narrow at base and apex and 

 rather densely appressed, short, blackish setate on all 

 sides and with quite stout, rather long, black, tubercu- 

 late bristles. There are 3 dorsolateral bristles, the last 

 element at the outer sixth and forming part of a sub- 

 apical, dorsal pair; and 1 member at the base may be 

 yellow. The anteroventral margin has 5, the basal one 

 yellow. Apex dorsomedially with 1 ; subapex medially 

 with 1 ; also there are 2 yellow bristles medially on the 

 basal half. The hind tibia is relatively slender toward 

 the base, a little wider distally, with similarly appressed 

 pile and quite stout, rather long, cliiefly, black bristles. 

 These consist of 2 dorsolateral, 1 before and 1 after the 

 middle; 1 ventrolateral at the outer fifth; 1 dorsal at 

 the extreme base ; and 2 weak yellow dorsal bristles be- 

 yond the middle. The apex with 2 ventral, 1 lateral, 

 2 dorsal, and 1 medial bristle. A medial mat of ap- 

 pressed pile covers the outer two-thirds. The middle 

 femur is distinctly thickened through the middle and 

 bears 3 stout, long, black, appressed bristles on the an- 

 terior margins, 3 on the ventral anterior margin be- 

 ginning at the basal third, 1 at the posterior apex, and 



1 weak, anterior counterpart. The middle tibia has 

 rather short, stout bristles, 3 dorsally, 3 posteriorly, 

 and 2 ventral bristles, long and stout. 



The anterior femur is thickened mostly toward the 

 base and bears at the apex 2 weak bristles dorsally and 



2 anteriorly ; the ventral margin on the basal half has 

 9 or 10 exceptionally long, straight, erect, slender, 

 ventral, golden bristles. Anterior tibia with 1 dorsal, 

 basal, 2 posterodorsal beyond the middle, rather short, 

 and 1 very strong, long posterior at the outer fifth, 

 besides 2 long, slender, posteroventral bristles before 

 and after the middle. The basitareus is rather short, 

 nearly as long as the next two segments with extremely 

 long, stout bristles posteriorly at base and apex and 2 

 almost equally long or stouter elements anteriorly at 

 the apex. Claws long, rather blunt, without being dis- 

 tinctly obtuse; they are strongly curved only near the 

 apex. The pulvilli reach the end of claw and are sub- 

 truncate; empodium long, and much thickened and 

 stout at base. 



Wings: The wings are slender. The subcostal cell 

 is narrow but the marginal cell is of nearly average 

 width, but bears an exceptionally long stalk. The mar- 



