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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



the base is gently swollen and convex. There is a 

 rather high, thin, dorsal, medial ridge beginning at the 

 base and ending abruptly a short distance from the apex. 

 Apex obtusely rounded, with numerous, short, stiff 

 bristles ; the swollen, ventral, basal half bears numerous, 

 long, slender bristles. Palpus clearly of two segments ; 

 the first, short and excavated and medially fused, bears 

 dense, long, bristly pile below ; the second, cylindrical 

 and robust and twice as long as the first, bears numerous 

 slender bristles dorsally, ventrally at the apex, and lat- 

 erally on the basal half. Antenna attached at the upper 

 fifth of the head ; the first segment is nearly three times 

 as long as the second and distinctly robust, with 2 or 3 

 moderately long, stout bristles ventrally; on both seg- 

 ments are additional, short, slender bristles ventrally, 

 laterally, and dorsally. Third segment broadly oval, 

 strongly convex below and widest in the middle ; it is IV2 

 times the combined length of the first two segments, 

 with an apical pit which contains a short visible spine. 



Head, anterior aspect : The face below the antenna is 

 about one-third the head width and slightly divergent 

 below. The pile of the face is short and bristly on the 

 dorsal half, becoming longer in the middle; there are 

 several rows of exceptionally long, basally stout bristles 

 on the lower portion of the face, and these are continued 

 down the upper half of the lateral subepistomal margin. 

 Front short and pollinose, with a stout bristle on each 

 side opposite the antenna and with at most 1 or 2 fine, 

 short, bristly hairs above and along the eye margins. 

 Ocellarium large and high, bluntly conical, with rather 

 strongly sloping sides and bearing across the middle a 

 pair of long, stout, divergent bristles and both laterally 

 and between the posterior ocelli a pair of short, stiff 

 hairs. 



Thorax: The thorax is densely pollinose; for the 

 most part dark on the pleuron but mostly pale on the 

 mesonotum. There is a band of rather short, fine, red- 

 dish, subappressed acrostical setae disposed in 3 or more 

 rows which are separated by a narrow, bare stripe from 

 a band of slightly longer dorsocentral elements. The 

 dorsocentral bristles become only slightly longer and 

 stouter posteriorly. Humerus long pilose. Lateral 

 bristles are rather long and stout and light reddish 

 brown and consist of 2 notopleural, 3 supraalar placed 

 before and above the wing, 3 postalar, and 3 pairs of 

 bristles on the scutellum. The disc has some fairly 

 long, suberect, reddish pile. Metanotal slopes micro- 

 pubescent only. Upper posterior slopes of mesopleuron 

 with 3 quite long, reddish bristles, the more dorsal ones 

 quite stout, and with about 12 stiff, reddish hairs which 

 are half as long as the bristles. Pronotum with 7 to 10 

 pairs of stout, reddish bristles. Metapleuron with ex- 

 ceptionally long, slender, brownish yellow bristles, 3 

 or 4 in number, curved downward at the apex with some 

 8 or 10 more slender, reddish hairs not quite as long and 

 not curved. Hypopleuron with 8 or 10 hairs; ptero- 

 pleuron pubescent only. Metasternum with long, fine 

 pile laterally throughout its length ; ventral metaster- 

 num with a low, medial elevation and a few fine, bristly 

 hairs; postmetacoxal area membranous but the lateral 



margins of the metasternum strongly encroach, leaving 

 only about one-fourth of the postmetacoxal area mem- 

 branous ; tegula with setae. 



Legs: Hind femora distinctly elongate, gradually 

 thickened from the base until on the outer third it is 

 nearly twice the basal thickness. It is densely, fine ap- 

 pressed pilose with weak bristles consisting of 3 lateral, 

 1 dorsomedial subapical, and 1 lateral bristle rather 

 close to the apex, and 4 long, quite slender pairs of red- 

 dish dorsal bristles. Ventrally this femur has a sparse 

 fringe of fine, long, erect pile growing a little longer 

 medially and 4 weak, slender, medial bristles. Tibia 

 slender, with weak bristles consisting of a double row of 

 3 long, oblique, dorsal elements ; it also has a fringe of 

 long, sparse, ventral and lateral pile; medial surface 

 with a golden mat of setae on the apical fourth. Middle 

 femur with, just beyond the middle, 1 rather stout, red- 

 dish, anterior bristle, and at the apical sixth 1 postero- 

 dorsal, the ventral and posterior margins with some 

 rather long, fine hairs, and the posterior margin at 

 the base with 1 bristle. Middle tibia with a quite 

 long fringe of slender, bristly pile on the ventral, an- 

 teroventral and postero ventral surfaces; these fringes 

 contain some 20 or more elements in each row of vary- 

 ing thickness. Anterior femur with a basal, posterior 

 bristle which may be doubled and another on the apical 

 fifth, besides 1 anteriorly quite close to the apex. The 

 anterior tibia is like the middle tibia with extremely 

 long, nearly erect, fine reddish golden pile on the same 

 surfaces, and posteriorly with 13 or 14 slender, very 

 long, reddish bristles. The apex anteriorly has 1 quite 

 long, slender bristle. Claws sharp and strongly bent 

 at the apex ; the pulvilli three-fourths as long as claw ; 

 empodium long and bladelike. 



Wings : The subcostal cell is quite narrow. Marginal 

 cell closed with a long stalk. Anterior branch of the 

 third vein nearly but not quite straight ; it has a quite 

 shallow sigmoid curve intermediate between the 

 straight vein found in Pagidolaphria Hermann and the 

 strong sigmoid vein found in Laphria Meigen or Ali- 

 piolaphria Carrera. First posterior cell widely open. 

 The posterior cross vein is long and drawn backward 

 and lies parallel to the posterior wing margin. Anal 

 cell closed with a long stalk. Alula large, ambient vein 

 complete. 



Abdomen: The abdomen tends to be slightly wider 

 posteriorly ; the first tergite is at least three- fourths as 

 long as the second, gradually swollen in the middle or 

 widened so that it is laterally convex and distinctly 

 wider than the second tergite. All the tergites laterally 

 have moderately long tufts of fine, erect, yellow pile 

 which is a little shorter posteriorly and each tergite 

 bears laterally in the middle a strong, conspicuous, 

 somewhat curved, reddish bristle; there are 4 on the 

 first tergite, 3 on the second and third, and 2 on the 

 fourth and fifth tergites. In the males there are six 

 tergites only, the sixth is two-thirds to three-fifths as 

 long as the fifth and there may be a short, protruding 

 edge of the seventh tergite barely visible dorsally. In 

 the females there are eight tergites, the seventh and 



