46 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



The narrow strip between the fold and the anterior margin bears a 

 very few long, well-separated setae on the caudal margin, except on 

 the seventh segment, where these setae are about twice as numerous. 

 The main part of the tergite has a rather conspicuous vestiture of 

 long setae. These are set in punctures not noticeably larger than the 

 base of the setae, and separated from each other on the median area by 

 from three to five times their own width, but near the sides by slightly 

 less. At the sides of the seventh segment this vestiture is even slightly 

 denser. Anteriorly on each segment the setae become more sparse and 

 leave a narrow irregular impunctate strip just posterior to the fold 

 or suture. Along the posterior margin the setae are arranged in a 

 single series close to the edge. They are close-set, with the punctures 

 anastomosing, and thus form a kind of marginal fringe. These setae 

 are nearly twice as long as the discal ones. This occurs only on the 

 third to sixth segments. The surface of all these tergites is minutely 

 transversely strigulose, and the setae are interspersed with numerous 

 tiny lageniform pores. 



The eighth tergite is the last exposed tergite and is broadly tapered 

 and rounded behind. The sculpture and vestiture are similar to the 

 preceding segments, except that the discal setae are less conspicuous, 

 separated by three to five times the width of their punctures, and not 

 arranged in a definite posterior marginal series. 



The sternites of the third to seventh abdominal segments (fig. 9 A) 

 are very similar in structure, vestiture, and sculpture, but differ slightly 

 among themselves in form. They decrease in width slightly from the 

 fifth posteriorly, while increasing in length from the third to the 

 seventh. They extend around the lateral aspect onto the dorsum and 

 are marked with an anterior marginal fold or suture (sts) similarly 

 to the tergites. This suture is somewhat arcuate and disappears neai 

 the side of the ventral aspect. The third sternite (s. j) is narrowed 

 in the middle so that it is about one-half as long at that point as at 

 the sides. The eighth sternite (s. 8) is narrowed and rounded 

 posteriorly similarly to the tergite in the female, but in the male 

 is broadly and shallowly emarginate at the middle. Each of these 

 six sternites is clothed very similarly to the tergites. The setae are 

 long and slender, the punctures small and placed at three to five times 

 their own width apart, a little more numerous at the sides of the venter, 

 and arranged in a single closely spaced series along the posterior mar- 

 gin. This series is present on all the sternites from the third to the 

 eighth. The strip anterior to the suture is sparsely clothed, and a 

 narrow line posterior to it is smooth. The longitudinal strigulations 

 are much finer than on the tergites, being very indistinct except on the 



