230 



UNITED STATES NATIONAL MUSEUM BULLETIN 224 



PAET 1 



middle of the ventral margin has 2 or 3 bristly, diver- 

 gent hairs on either side; the base below however is 

 without pile, the ventral surface has a distinct medial 

 fissure or groove. The proboscis is held obliquely for- 

 ward and downward. The base behind has a con- 

 spicuous row of transverse bristles. Palpus is large, 

 the first segment excavated, the second cylindrical but 

 more or less swollen and microporate at apex; the 

 dorsal and ventral surfaces each with a few stout 

 bristles. Antenna as long or slightly longer than the 

 head. The first two segments combined are only a 

 little less than half the total length of antenna ; second 

 segment is one and a half times as long as the first 

 segment. Third segment moderately dilated through 

 the middle and narrowed near the apex; no micro- 

 segment present, the apex is truncate, with a small 

 circular opening and short, central spine. Dorsally the 

 third segment bears 6 to 12 long setae or short bristles. 



Head, anterior aspect: The face below the antenna 

 is a third the head width, very slightly divergent below. 

 Subepistomal area large, nearly as long as the face, 

 oblique, concave and bare. Face pubescent, apilose 

 with only a few minute, short, inconspicuous hairs and 

 with a characteristic row of quite stout, long bristles 

 above the epistomal margin which consists of 3 or 4 

 pairs. The antenna is attached at the upper fourth 

 of the head; the first segment is shorter than the 

 second, a little longer than high, the second segment 

 may be nearly twice as long as the first segment. The 

 third segment is not quite twice as long as the com- 

 bined length of the first two segments; it is flattened 

 laterally on the basal portion and begins to expand 

 near the base until in the middle it is fully twice as 

 high as the second segment and from this point it is 

 gradually attenuate. The apex is more or less obliquely 

 truncate and has a distinct, apical spine. First seg- 

 ment with 2 or 3 minute lateral and dorsal setae ; second 

 with similar somewhat longer setae dorsally and ven- 

 trally and with a ventral subapical, short, stout bristle; 

 third segment with about 8 middorsal setae. Anterior 

 eye facets moderately enlarged. 



Thorax: The thorax is strongly pollinose; the pile 

 of the mesonotum including the humeral pile is very 

 scanty and consists of short, erect, stubby setae. A 

 single acrostical row of similarly short setae is sep- 

 arated by a wide, bare space; dorsocentral setae are 

 differentiated posteriorly but of the same length except 

 for 1 or 2 elements, which become quite, stout before the 

 scutellum. The following complement of long, stout 

 bristles is present laterally: 1 numeral, 3 notopleural 

 in a longitudinal row, 2 supraalar, 2 postalar, and a 

 single pair or sometimes 2 pairs of stout scutellar 

 bristles, the pairs set far apart. Scutellum flat with 

 transverse grooves, pollinose and apilose. Propleuron 

 with scanty, stiff pile vent rally; the anterior collar 

 has 6 to 8 pairs of bristles which are rather stout, the 

 dorsal postpropleuron with 2 or 3 fine, bristly hairs 



or 1 or 2 minute setae. The sternopleuron, mesopleuron, 

 pteropleuron, and hypopleuron are apilose but densely 

 pollinose. Metapleuron with a prominent, vertical row 

 of 7 or 8 stout bristles and some additional, long, 

 stiff hair behind paralleling the bristles. Metanotal 

 slopes micropubescent only ; tegula with bristles ; lateral 

 metasternal slopes pilose, ventral metasternum narrow, 

 chitinized, apilose or at most with 1 or 2 hairs; 

 postmetacoxal area membranous ; basalare sclerites with 

 only 1 or 2 fine hairs or bare; prosternum dissociated. 



Legs: The legs are stout without being swollen and 

 with scanty, short, appressed, setate pile. The fol- 

 lowing complement of bristles is present: the hind 

 femur with 7 short lateral and 6 equally short ventral 

 bristles; the apex has setae only. The hind tibia has 

 stout but only moderately long bristles, curved and 

 suberect, consisting of 4 dorsomedial, 5 quite short 

 dorsolateral; also 5 ventrolateral, the basal 3 quite 

 short, the 2 on the outer fourth long. Apex with stout, 

 long bristles, 1 dorsal, 1 very long lateral, 6 ventral 

 elements. This tibia has a brush of setae beginning 

 at the outer third, no other ventral pile. The hind 

 femur is without ventral pile. Basitarsus robust, a 

 little longer than the next three segments; end tarsal 

 segment nearly as long as the preceding three segments 

 and arched on all legs. Middle femur with 2 stout 

 bristles anteriorly. Its tibia with short, stout bristles, 

 6 anterodorsal, 5 posterodorsal, 6 posterior, and 2 or 3 

 postero ventral, the last quite long; ventrally there is 

 a single bristle at base and no pile. Anterior femur 

 with 4 posterior, 1 anterobasal, 6 anteroventral ; ante- 

 rior tibia with very short, stout bristles, 10 or 11 antero- 

 dorsal, 5 posterodorsal, 7 posterior, and 2 posteroven- 

 tral. The apex has stout bristles and a very stout, 

 curved spur carried by a basal protuberance together 

 with corresponding denticles on the basitarsus. An- 

 terior tarsi end in slender, thin pulvilli which extend 

 from two-thirds to three-fourths the length of the sharp 

 claw. Middle and posterior tarsi end in minute stubs 

 for the pulvilli, which ordinarily do not extend beyond 

 the swollen base of the claw. Empodia long and blade- 

 like. The claws have a strong tendency to be apposed. 



Whigs : The marginal cell is open, slightly less than 

 its maximum width ; anterior branch of the third vein 

 ends above the wing apex ; posterior branch far behind. 

 First posterior cell open hi full width, fourth posterior 

 cell closed and stalked, its end vein and the lower end 

 vein of the discal cell make a very low, obtuse angle 

 but are not quite in a straight line; anal cell narrowly 

 closed; alula large; ambient vein complete. 



Abdomen: The abdomen is cylindroid, slightly tap- 

 ered; the abdomen is nearly as long as wings. First 

 tergite is only slightly swollen laterally ; seven tergites 

 present in the male with slight linear trace of the 

 eighth on the right side; eight tergites in the female, 

 the eight is half as long as the seventh. Pile of abdo- 

 men minute, fine, setate and scanty, suberect or ap- 



