481 



alo-ventral row of setae, and a broad dorsal stripe, frequently divided 

 by a faint line or row of spots; tibiae yellow, with a dark stripe includ- 

 ing the cephalo-ventral setae ; tarsi and claws shining black ; wings 

 clear, with eleven postnodals in the front wing and nine or ten in the 

 hind ; stigma pale brown, surmounting about one and one-half to two 

 and one-half cells; M 2 arising between the third and fourth postnodal 

 cross-veins in the front wing and between the second and third in the 

 hind wing ; paraptera brown, caudal margins black. 



Abdomen black and buff; terga i-io with broad black longitudinal 

 stripes, the lateral margins with broad pale stripes, the pale color ex- 

 tending well to the dorso-meson in the form of basal rings on segments 

 three to seven inclusive ; first tergum with a black spot near the latero- 

 ventral margin, terga three to eight with narrow apical black rings 

 reaching their lateral margins ; anal appendages black (Figs. 123, 124) 

 and reddish, the superiors compressed, the ventro-mesal margins with 

 large subbasal teeth and a few setae beyond these to the apical third ; 

 inferiors shorter than the superiors, usually less than half the length 

 of the latter and provided with a fine brush of silken hairs; sterna 2-9, 

 inclusive, black, the tenth being pale and the first with a black median 

 spot. 



Female. — Color similar to that of the male. 



Head and thorax similar to those of the male. 



Abdomen with interrupted basal rings on terga 3-6, inclusive, 

 the lateral stripes broader than those of the male ; sterna 2-7 black, one 

 with a black median spot and eight with a median black stripe; anal 

 appendages of the usual type ; superiors black ; ovipositor with a black 

 line along the ventral margin, the margins serrate ; prostyles dark, long, 

 and nearly straight ; ventral margins of the ninth tergum black imme- 

 diately dorsad of the ovipositor. 



Measurements 



Length, $ 34-35 mm. 



Length, 9 32-36 mm. 



Length of abdomen, $ 28 mm. 



Length of abdomen, 9 24-29 mm. 



Length of hind wings, $ 19-20 mm. 



Length of hind wings, 9 19-22 mm. 



Width of hind wings, $ 4 mm. 



Width of hind wings, 9 4 mm. 



This species is distinguishable from disjunctus, to which it seems 

 most closely related, by the metepimeral spots ; the males, by the short- 

 ness of the inferior appendages. The compound eyes are blue in life. 



