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UNITED STATES NATIONAL MUSEUM BULLETIN 224 



and densely covered with coarse, rather long, erect pile 

 changing above the middle to equally dense, though 

 slender bristles extending all the way up behind the 

 vertex. At the bottom of the eye the occipital pile is a 

 little more fine. Proboscis moderately robust, nar- 

 rowed at the ajDex and on the outer fifth, and with the 

 base rather strongly swollen ventrally. There is also a 

 conspicuous, high, arched, dorsal carina along the 

 middle. Palpus remarkably large and elongate, espe- 

 cially the second segment ; the basal segment is short and 

 more or less fused. Whole ventral and lateral margin 

 of the long, stout, second segment covered with nu- 

 merous, long, coarse hairs. Antenna elongate and slen- 

 der, slightly longer than the upper half of the head, the 

 slender first segment is IY2 times as long as the second 

 segment and bears rather dense, long, coarse pile above, 

 below, and laterally. The second segment is a little 

 more than twice as long as its apical width, narrowed 

 toward the base and has 1 long stout and 1 somewhat 

 shorter ventral bristle near the apex and a likewise dis- 

 proportionate pair of only slightly shorter bristles dor- 

 sally. Third segment nowhere wider than the second. 

 It is IY2 times as long as the combined length of the first 

 two segments, slightly narrowed at the immediate base 

 and apex and bears a downwardly directed, slender 

 microsegment with blunt apex and minute bristle. 



Head, anterior aspect: Below the antenna the face 

 is about a sixth the head width and moderately widened 

 below. Front slightly wider than the upper face, the 

 vertex but little excavated, the ocellar tubercle large 

 and low with 4 pairs of slender, only moderately long, 

 yellow bristles. 



Thorax: Whole mesonotum densely long, more or 

 less erect, bristly pilose, the pile undifferentiated, ex- 

 cept behind the oblique, posterior suture. The postero- 

 dorsal central area bears 4 or 5 moderately stout, long 

 bristles, together with additional, less stout bristles. 

 jSTotopleuron with 2, supraalar region with 8 or 10, and 

 the postalar callosity with 6 to 8 long, quite strong, red- 

 dish bristles. Scutellum large, flat, pollinose with no 

 basal depression; the disc with some long, coarse pile 

 on the outer half and the whole margin with a wide 

 band of numerous, quite long, slender bristles and 

 bristly hairs. Dorsal margin of the mesopleuron nar- 

 rowly bordered with dense, long pile. Humerus with 

 dense, coarse, rather long pile. Metanotal callosity 

 pollinose only. Metapleuron with a large, oval or sub- 

 circular patch of long, slender, bristly hairs. Whole 

 of the propleuron both above and laterally with ex- 

 ceptionally numerous, long, erect, coarse hairs. Pres- 

 ternum dissociated. Hind coxa with a prominent, an- 

 terior, bristly ledge. 



Legs : All the femora are quite stout but not otherwise 

 swollen. They are relatively short with the hind femur 

 a little longer than the middle femur and all the femora 

 are densely covered with coarse, appressed, pale, bristly 

 pile, which becomes a little longer below. Hind femur 

 with a ventrolateral fringe of moderately long, slender, 

 bristly hairs in 2 or 3 rows of 12 or 15 elements each. 



Among these and near the apex are 2 or 3 slender 

 bristles. All the tibiae are quite stout and robust, es- 

 pecially the hind tibia, which is nearly as long as the 

 femur and has 4 moderately long, stout, brownish 

 yellow, dorsolateral bristles; 4 shorter, ventrolateral 

 bristles; and 7 longer, dorsomedial bristles. Middle 

 tibia with a double, dorsal row, each row containing 

 6 or 7 short, yellow bristles, and 5 slightly longer, ven- 

 trolateral bristles. Pile of all the tibiae rather dense 

 and shaggy, coarse, subappressed, and a little longer 

 than that on the femora. The tarsal segments are re- 

 markably shortened, the anterior tarsus and middle 

 basitarsus, as well as their ultimate segments, are each 

 barely or scarcely longer than wide and the intervening 

 segments are considerably shorter than wide. Hind 

 basitarsus quite stout and robust and nearly or quite as 

 long as the next three segments. Claws stout, sharp, 

 pulvilli long and wide, the empodium stout at the base. 



Wings : The wings are comparatively long and slen- 

 der, the marginal and submarginal cells equally widely 

 open, the posterior cells all widely open, the anal cell 

 widely open. Alula large, ambient vein complete, the 

 third vein forks beyond the end of the discal cell. Pos- 

 terior crossvein reduced, the anterior crossvein is a little 

 oblique, and enters the discal cell a little before the 

 middle, Postmarginal fringe in two diverging rows. 



Abdomen : The abdomen is comparatively robust, and 

 the first three tergites are as wide as the mesonotum, and 

 from this point slightly narrowed. All the tergites 

 strongly convex, the posterior part of the abdomen al- 

 most cylindrical and the rather long, eighth tergite 

 slanted obliquely downward. Pile of abdomen rather 

 dense, coarse, erect and bristly, becoming progressively 

 longer toward the base of the abdomen where is forms 

 long tufts on the sides of the first three tergites, some- 

 what shorter on the next two; on the last three it is 

 curiously directed forward, regularly spaced, coarse 

 and rather setate. Sides of first tergite with 7 long, 

 curved bristles of moderate stoutness. Sternites with 

 long, abundant, coarse, erect pile but the seventh and 

 eighth sternites with the forward directed or erect setate 

 pile. Last sternite forms an unusually long, troughlike, 

 apically rounded scoop which extends well beyond the 

 ninth tergite. The acanthophorites bear 6 pairs 

 of stout, blunt, black spines. Postmetacoxal area 

 membranous. 



Distribution: Ethiopian: Pijcnomerinx annulatus, 

 new species. From Ehodesia. 



Pycnomerinx annulatus, new species 



Length 17 mm. including antenna. 



Female. Plead : The head is black ; pollen of upper 

 vertex and front pale brownish or yellowish grey; on 

 the lower occiput the pollen is greyish white. Face 

 with dense, greyish white, coarse micropubescence, 

 which along the eye margins on the upper half tends 

 to leave little, narrow, linear, bare stripes. Cheeks 

 shining black and bare, all pile and bristles of head very 

 pale brownish yellow, almost whitish in color. The ter- 



