FIELD BOOK OF INSECTS. 



2. Propodeum (apparently the hind part of the thorax) 

 indented behind. Bicyrtes ( = Bembidula) quadrifasciata 

 (length about .75 in.; metanotum black; abdominal 

 spots much wider at the sides), and ventralis (about .5 in.; 

 metanotum with yellow spots; abdominal spots but 

 little, if any, wider at the sides). 



Propodeum not indented behind, straight or con- 



vex ........................... : ................... 3. 



3. Front ocellus round or kidney-shaped. Stictia Caro- 

 lina is an inch long and marked with black and yellow. 



Front ocellus narrow. Bembex, of which spinolce 

 (Plate XCII) is our common species. 



These are the Thread-waisted Wasps. There have 

 been a number of unfortunate, but necessary, changes of 

 scientific names. Most confusing of these is the use of 

 Spliex for what had been called Ammopliila. I fear the end 

 is not yet. 



Chlorion is distinguished from the rest of the family 

 by the_ second and third submarginal cells each receiving 

 a recurrent vein; in the others, the second receives both. 

 The females make burrows in the ground for nurseries. 

 The following subgenera (or genera) occur in the Northeast 

 and elsewhere. 



1. Second submarginal cell wider than long ............ 2. 



This cell longer than wide ........................ 3. 



2. Tarsal claws with one inner tooth. Chlorion, in a 

 restricted sense. Provisions its nests with crickets. 

 Our common bronze- or purplish-blue species is cyaneum. 



Claws with 3 to 6 teeth. Priononyx; abdomen of 

 bifoveolatum is reddish or yellowish, that of atratum is 

 dark brown or black. The latter, at least, provisions with 

 grasshoppers. 



3. Petiole of abdomen more than twice the length of the 

 hind coxas; marginal cell not extending beyond the third 

 submarginal cell ............................. Isodontia. 



Petiole of abdomen as long, or only a little longer 

 than, hind coxae; marginal cell extending beyond the third 



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