North American Hymcnoptera . 



389 



Inhab. Mexico. 



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Head yellow : nasus with black sutures and line before 

 from the middle bifarius near the antenna : mandibles 

 piceous at tip : antenn<B reddish-brown, darker above, and 

 * on the first joint yellow beneath : vertex black, of w hich 

 two broad lines descend to the antennae and one descends 

 each side, for a short distance, posterior to the eyes ; a 

 yellow oblique line from the summit to the tip of the 

 eyes : thorax black, with two yellow vittas ; collar , with 

 an abbreviated line before the wingSj and a transverse 

 anterior one, black : wings slightly ferruginous on the 



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costal margin : &cutel and segment beneath it yellow, the 



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former black in the middle : metathorax yellow, a black 

 vitta, and lateral basal spot : ahdomen^ first segment peti- 

 oh form, as long as the second: tergum black, segments^ 

 on their lateral and terminal margins yellow, the latter 

 undulated before ; second segment yellow also at base i 

 beneath yellow, with black incisures : feet yellowish ; 



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posterior pair darker behind ; venter yellow, with two or 

 three slender obsolete dusky bands. 



Length less than half an inch. 



3. P. valida. Yellow; middle of the thorax and base 

 of the segments of the tergum ferruginous. 



Inhabu Mexico. 



9 Sody dull yellow, with ferruginous sutures : head 

 above, and antennae at base, ferruginous : thorax on the 

 disk ferruginous : wings yellowish ferruginous :■ tergum 

 with the segments ferruginous at base : venter greenish- 

 yellow, at base ferruginous : feet ferruginous ; coxae and 

 part of the thigh yellow. 



Length over one inch* 



A large and rather robust species. The male is more 

 exclusively ferrruginous with the posterior pairs of tarsi 

 whitish ; the head in my specimen is destroyed. 



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