198 



UNITED STATES NATIONAL MUSEUM BULLETIN 22 4 



shaggy pile on the posterior half of the mesonotum. 

 Related to Eucyrtopogon Curran and Ilolopogon Loew ; 

 the face is actually plane, except for an abrupt exten- 

 sion immediately below the antenna; third antenna! 

 segment a little wider on the apical half and not atten- 

 uate from the base; midtibial apex without a pair of 

 contrasting, stout bristles. Scutellar disc with much 

 fine pile, the margin with only fine, long hairs. Wings 

 hyaline, the anterior crossvein at the middle of the 

 discal cell, the anal cell quite widely open. Length 

 9 mm. 



Head, lateral aspect : The eye is as convex posteriorly 

 as anteriorly, occiput very little developed, a little more 

 prominent below. The face is short, of about the same 

 extent above and below. It juts forward immediately 

 above the antenna and is nearly straight in profile. 

 Proboscis unusually robust and stout and while it is 

 rather short it extends distinctly beyond the face. 

 Lower surface of proboscis plane, dorsal apex broadly 

 rounded, with a prominent dorsal keel. Palpus of two 

 segments. Antenna attached to upper third of head 

 and about as long as the head. First segment shorter 

 than the second, bare, polished with 3 moderately long, 

 slender and 3 shorter, bristly hairs below and 7 setae 

 above. Second segment with 1 somewhat longer, stout 

 bristle, 2 shorter more slender bristles below and 6 setae 

 above. Third segment, excluding microsegment, IV2 

 times the combined length of the first two. In lateral 

 aspect this segment is wider on the outer half. The 

 two microsegments are short, especially the first one, 

 stout and robust. The second sharply attenuate with a 

 bristle at the tip. 



Head, anterior aspect : Face below antenna a fourth 

 the head width, the eyes anteriorly flattened and the 

 medial facets quite greatly enlarged, and likewise flat- 

 tened. The face widens a little below and bears, begin- 

 ning almost immediately beneath the antenna, abund- 

 ant, long, coarse, bristly pile, which might be described 

 possibly as very slender, weak bristles. Lower elements 

 of the mystax slightly longer but no thicker than the 

 upper ones. Front of about the same width throughout, 

 at most very slightly widened uniformly from antenna 

 to vertex. Vertex a little excavated, the ocellarium large 

 with vertical sides. Anterior ocellus enlarged with 

 several interocellar hairs. Sides of front with a row of 

 some 6 or 7 long, slender hairs. 



Thorax: The thorax is rather strongly raised and 

 convex equally in front and behind, and somewhat 

 laterally compressed. Also, anteriorly between humerus 

 and the middle of the mesonotum is a very shallow and 

 granulate depression. There is a double row of acros- 

 fcical, moderately long, curved hairs. Dorsocentral 

 elements are not differentiated from those to one side, 

 although behind the suture the whole posterior mesono- 

 tum bears dense, long, coarse, golden, suberect, slightly 

 crinkled pile, and similar pile is found plentifully on 

 the disc of the scutellum. Scutellar margin with only 

 5 or 6 pairs of long, stiff hairs. Metanotum with pubes- 

 cence only. Metapleuron with a wide patch of slender, 

 long bristles. Pleuron coarsely micropubescent with a 



band of fine, long hairs as on the posterior margin of 

 the mesopleuron. Lateral margins of the mesonotmn 

 with quite weak bristles, 2 on the notopleuron and 

 several bristly hairs on the postalar callosity. The 

 mesopleuron is bare, except for sparse, pollenlike micro- 

 pubescence laterally, and coarse, appressed micropubes- 

 cence anteriorly on the depressed area and on the 

 humerus. Humerus with numerous, long hairs. 



Legs : All the femora are a little swollen, shining and 

 metallic green. The bristles are absent, the pile is 

 mostly erect, fine, abundant, long along the ventral sur- 

 face of all the femora and rather narrowly appressed 

 along the dorsal surface of the hind femur, less so on 

 the middle femur. The hind tibia is rather exception- 

 ally stout, almost as much so as the hind femur. All the 

 tarsi, however, moderately narrow, neither slender nor 

 swollen, including hind basitarsus. The basal segment 

 of the hind tarsus is longer than the next three, each of 

 which are beadlike. Pile of hind tibia rather abundant 

 but scattered and bristly for the most part. The medial 

 surface beyond the base bears an unusually dense brush 

 of suberect, bristly pile. The hind tibia has 8 slender 

 bristles, partly in 2 rows and 3 rather stout, lateral 

 bristles, which are tuberculate, and a number of slender 

 bristles and 1 stout bristle ventrally. Middle tibia with 

 the anterodorsal and the ventral bristle only well de- 

 volped and 4 to 6 in each row. Apex of this tibia with 

 short, stout bristles, but without especially contrasted, 

 medial bristles. Anterior tibia with poorly developed 

 bristles postero vent rally only, but with numerous, 

 coarse, short, bristly hairs which are subappressed. 

 This tibia has an extensive, medial band of appressed, 

 dense setae. Apex without spine. The claws are 

 strongly bent toward apex, sharp, the pulvilli large and 

 long._ 



Wings: The wings are pale brownish hyaline and 

 iridescent. Marginal cell and all posterior cells quite 

 widely open. Anal cell unusually widely open. Pos- 

 terior crossvein long. Anterior crossvein enters the 

 discal cell at the middle. Third vein branches at or 

 slightly before the middle of the discal cell. Ambient 

 vein complete. Whole wing microvillose. Posterior 

 fringe long and in one row. Alula moderately deep. 



Abdomen : The abdomen is a little wider toward the 

 base than the mesonotum, tapered beyond the fourth 

 segment. Second to fourth segments of nearly equal 

 length. Abdomen polished, shining, bottle-green, or 

 green as in a Lucilia blowfly. Posterior margins on the 

 lateral fourth or fifth of each segment grey pollinose, 

 except the last two, but of greatly reduced extent on the 

 first and sixth segments. Pile erect, short, fine and 

 pale. Males with prominent terminalia, the epan- 

 drium large and triangular, with a tiny notch at apex 

 and with a crease running to the base which seems not 

 to be divided. Gonopods quite large and convex. 

 Hypandrium also prominent and ventrally convex. 

 Females with 5 pairs of short, rounded spines on the 

 acanthophorites. 



Distribution: Neotropical: Sintorla emerctlda, new 

 species. 



