58 Myron Harmon Szvenk 



First abdominal tergite with a broad and complete or narrowly inter- 

 rupted yellow band, this sometimes (e. g., crawfordi) reduced 

 to yellow lateral spots 2 



I. Clypeus, supraclypeus and lateral face marks, which nearly or 

 quite fill the space up to level of insertion of antennae, yellow 

 or yellowish ; tubercles yellow ; front wings usually with only 

 one or two submarginal cells in one or both wings ; yellow 

 bands on tergites 2-5, that on 2 much narrowed and sometimes 

 subinterrupted medially; usually only small rounded yellow 

 spots on sides of propodeum, and these sometimes obsolete, 

 none on enclosure ; 7-8.5 mm ohliterata 



I. Clypeus, supraclypeus and sides of face red, without any distinct 

 yellowish suffusion; tubercles usually red, sometimes suffused 

 with yellow ; front wings with three submarginal cells ; yellow 

 bands on tergites 2-5, that on 2 uniformly broad, not narrowed 

 medially; propodeum with large yellow areas on sides coalesced 

 with large spots on enclosure to form a broad yellow band 



on each side ; 9-10 mm elrodi 



2. Mesopleura largely red; mesoscutum and mesoscutellum red; band 

 on tergite i usually interrupted, often reduced to lateral spots; 

 legs mostly red, the knees, anterior femora in front, and the 

 first four tarsi with posterior margin of hind tarsi, usually 



yellow or suffused with that color; 10-12 mm crawfordi 



2. Mesopleura yellow or mainly black ; mesoscutellum yellow or spotted 

 with yellow ; band on tergite i complete or but narrowly inter- 

 rupted 3 



3. Legs red, all the knees and a broad line on outer face of tibiae 

 yellow, areas on coxae, trochanters and femora behind and a 

 stripe on hind tibiae, black ; mesopleura mainly black, propo- 

 deum black with two yellow spots, mesoscutellum with two yel- 

 low spots ; mesoscutum black or with four yellow lines ; abdo- 

 men black, with broad yellow bands; 8-9 mm civilis 



3. Legs bright yellow, only the coxae, trochanters and femora behind 

 with a small suffusion of red, black only on spots on coxae 

 behind and narrow stripes on hind femora and tibiae; meso- 

 pleura, propodeum except extreme sides and a median line, 

 elevated portions of mesoscutellum and metanotum, and lateral 

 lines on mesoscutum, bright yellow ; mesoscutum discally black 

 with two broad red lines ; abdomen yellow, its base and narrow 

 apical margins of the tergites reddish ; 9 mm, 



cltrina flavoJiiarginata 



(The female of fragilis is unknown or unrecognized). 



58 



