486 



UNITED STATES NATIONAL MUSEXIM BULLETIN 224 



sides the front is widely covered Tvith mmieroiis, long, 

 rather strongly appressed, stiff, flattened or bristly 

 hairs. Vertex moderately excavated, with slanting 

 sides; ocellai'ium modei-ately large, with a single pair 

 of moderately long, slender bristles and numerous, 

 Sorter, fine, divergent hairs. Eyes with tlie facets cen- 

 trally enlarged. 



Thorax: The pleuron pollinose; the mesonotum is 

 widely pollinose laterally on the humerus and on dorso- 

 lateral stripes or bands. Pile of mesonotum abundant 

 but for the most part consisting of microscopic, stout, 

 more or less appressed setae, quite short but longer 

 along the anterior margin and laterally. Acrostical 

 elements present but poorly differentiated. Dorsocen- 

 tral elements differentiated at the postalar level where 

 there are 4 exceptionally stout, long bristles in eac'h 

 row. Humerus with abundant, long, erect pile. Stout, 

 long, lateral bristles are present and consist of : 2 noto- 

 pleural, 1 supraalar, 1 suprapostalar, 3 postalar, and 3 

 to 7 pairs of scutellar bristles. Scutellum only moder- 

 ately thick, with distinct, impressed rim. The disc 

 bears numerous, erect, stiff hairs and 2 or 3 pairs of 

 additional, slender, submarginal bristles. Proplem'on 

 densely pilose, the lower portion with a dense mat of 

 long pile, the pronotum with 10 pairs of stout bristles. 

 Upper and posterior mesopleuron, the upper sterno- 

 pleuron, and pteropleuron with rather numerous, long, 

 fine hairs. Upper posterior corner of the mesopleuron 

 with 2 or 3 stout bristles ; pteropleuron with 2 or 3 bris- 

 tles; posthypopleuron with 3 long, stout bristles and 

 considerable additional, stiff pile or weak bristles. 

 Metapleuron with 8 to 10 bristles in an in-egular row 

 and additional pile. Metanotal slopes with a large 

 patch of stiff, apically curled pile; lateral and ventral 

 metasternum with abundant, long, fine pile. Postmeta- 

 coxal area membranous ; tegula pubescent only ; squama 

 with a wide, multiple row of fine, fluffy pile. Proster- 

 num fused anterolaterally, half of the lateral part re- 

 placed by membrane posteriorly. 



Legs: The hind femur and tibia and to some extent 

 all the femora and tibiae are elongate and relatively 

 slender ; the anterior femur is a little thickened toward 

 the middle and the base and all bear dense, appressed, 

 setate pile on all surfaces. The hind femur has a com- 

 plement of stout, but rather short bristles, consisting 

 of 1 dorsomedial apical, 1 dorsosubapical, 5 lateral, 10 

 ventrolateral, 2 ventral near the middle, and 1 ventro- 

 medial bristle near the apex. Hind tibia with 4 quite 

 flat, appressed, dorsal bristles, 5 stout, dorsolateral, and 

 4 flat, appressed, ventrolateral bristles; apex with 8 

 long, stout bristles. Basitarsus slender, not quite as 

 long as the succeeding tliree segments. Middle femur 

 with 2 especially stout, posteroapical bristles, 3 an- 

 terior, and 8 ventral bristles. Its tibia has 3 flat ap- 

 pressed dorsal, 3 appressed anteroventral, and 3 oblique 

 posterodorsal, besides 8 short, ventral bristles. An- 



terior femur with a prominent, posterior row of 7 stout, 

 rather long bristles, 14 to 21 slender ventral, and 1 an- 

 teroventral apical bristle. The anterior tibia has 9 or 

 10 short, stout dorsal and 2 exceptionally long, stout, 

 conspicuous, posteroventral bristles at the middle and 

 beyond. Anterior basitarsus is long and slender and 

 slightly longer than the succeeding two segments. 

 Tarsi end in moderately large pul villi, which extend 

 two-thirds of the length of the claw ; the empodium is 

 exceptionally stout, of equal length ; and the stout claws 

 are moderately sharj^, strongly bent at the apex. 



Wings : Tlie wings are hyaline and distinctly wider 

 at the base, narrowing toward the apex ; the anal cell is 

 swollen posteriorly. The marginal cell is closed with 

 a short stalk, rippled and rather wide; the costa and 

 subcostal cells are not expanded, subcostal cell quite 

 narrow. Both branches of the third vein end before 

 the wmg apex ; tlie second submarginal cell takes origin 

 shortly beyond the end of the discal cell ; base of sec- 

 ond posterior cell scarcely widened, but first posterior 

 cell greatly narrowed in the middle, chiefly by the sec- 

 ond submarginal cell. The second posterior cell is quite 

 wide apically, the fourth vein being carried toward the 

 apex. Fourth posterior cell closed and stalked, slightly 

 convex anteriorly and distally ; lower end of the discal 

 cell carried far to the base ; anal cell closed and stalked. 

 Second basal cell ends in 2 veins ; alula large, ambient 

 vein complete. 



Abdomen : The abdomen is less wide than the meso- 

 notum, subcylindrical and distinctly tapered. The first 

 tergite laterally is unusually swollen and convex. The 

 pile of the abdomen is short, fine, flat appressed and 

 setate on the last four tergites, the middles of the pre- 

 ceding tergites and on the last sternites; but the pile is 

 long, abundant, fine and erect, almost bushy on the sides 

 of the first three tergites and rather long ventrally on 

 the second and third sternites. First tergite with a 

 single, long, stout bristle and 1 or 2 slender, bristly 

 hairs. Postmargins of second tergite laterally with 6 

 quite long, weak, slender bristles. Third tergite with 

 a like number of slightly weaker bristles. Eight ter- 

 gites present in the male, the last tergite is half as long 

 as the preceding, but longer laterally. Male terminalia 

 moderately large and elongate, of the open type ven- 

 trally. The superior forceps are long, more or less cy- 

 lindrical, a little narrowed, blunt with simple apex and 

 the proctiger lies flatly, inconspicuously between. The 

 gonopod and claspers are prominent but are not as long 

 as the upper forceps. Hypandriimi well developed; 

 aedeagus a simple tube. Last sternite umnodified. The 

 whole terminalia tend to be thrust upward. No fe- 

 males seen. 



Distribution : Palaearctic : Eccoptopv^ longif arsis 

 Macquart (1838) [ = e7ythrogastrus'Loevf (1871)'] ; lu- 

 cidus Becker (1907). Australian: Eccoptopus impiger 

 Wulp (1892). 



