Si)2 PROCEEDINGS OF THE ACADEMY OF [1895. 



4. Legs ferruginous ; wings tolerably smoky ; abdominal marks not 



very broad and widely separated internally ; rnesopleurae black 



capnoptera. 



Legs yellow ; wings scarcely smoky ; abdominal marks broad, 

 forming bauds; rnesopleurae more or less yellow parata. 



5. Two lines on dorsulum, scutellum anteriorly, metanotum (postscu- 



tellum), curved line on middle-segment above, and a broad line 

 on each side of all the dorsal abdominal segments, yellowish ; 

 hind tibia? striped with black above ; wings clear . . variegaia. 

 The dorsulum, scutellum, metanotum, and middle segment (except 

 latero-posterior angles) black, in rare cases only are these parts 

 spotted, and then only in a slight degree ; fifth and sixth dorsal 

 abdominal segments black, the former sometimes spotted in which 

 case the spots are widely separated ; hind tibia? not striped with 

 black; wings dusky, paler at base and apex . . . quadrifasciata. 



6. Legs, antennae in part, labrum and tip of abdomen ferruginous ; 



clypeus yellow insidiatrix. 



Legs black and yellow, the tibiae in part and the tarsi ferruginous ; 



antennae, labrum and the tip of abdomen not at all ferruginous ; 



clypeus black entirely, or with the base more or less whitish 



• . . . ventralis. 



MALES. 



1. Posterior coxae unarmed 2 



" Posterior coxae armed with a t< oth beneath." fodiens. 



2. Intermediate femora beneath at the base drawn out into a promi- 



nent tooth 3 



Intermediate femora not dentate beneath at base, at the most angu- 

 lar 5 



3. Joints seven to ten of antennae strongly rounded out beneath . . 4 

 " Joints seven to ten of antennae not rounded out beneath (legs fer- 

 ruginous) " insidiatrix. 



4. Clypeus entirely, dorsulum laterally, greater part of femora, the 



tibiae and tarsi entirely, bright yellow; markings of abdomen 

 sometimes united within, broader than in ventralis; wings clear 



parata. 



Clypeus black, or whitish at base only ; dorsulum not yellowish 

 laterally, the greater part of femora and the tibiae in part, black ; 

 fasciae of abdomen always separated internally, those on first seg- 

 ment variable in size ; wings a little infuscated . . . ventralis. 



5. Legs not ferruginous in part; wings, if dusky, but slightly so ; 



medial femora beneath not distinctly keeled, or angular at base . 6 

 Legs ferruginous and yellow, wings dusky; medial femora beneath 



distinctly keeled and angulate at base . capnoptera. 



(>. Greater part of clypeus, two lines on dorsulum (rarely absent), 

 scutellum anteriorly, metanotum, curved line on middle seg- 

 ment above, and a broad line on each side of all the dorsal abdomi- 



