118 GENKKA OF II VMKXorTKItA. 



from Washington Territory. Of Ny><son seventeen species have been 

 described, from all parts of the country, but nowhere coinnion. J| 



Family PHILANTHIDiE. 



Tliis interesting- family contains some of the most beautiful species 

 in the whole tribe of fossorial hymenoptera, and is easily distinguished 

 by the following characters : prothorax very short, transverse, not 

 extending back to the tegula; ; anterior wings with three complete 

 submarginal cells, of which the second and third each receive a re- 

 current nervure ; abdomen sessile or subsessile. 



Our genera may be separated in the following manner : 



Table of Genera. 



Third .siilnnaiginal cell imuh iiarrowod towards the iimr.Kiiml. leaving a broad 

 deep sinus between them, the former never extending beyond tlie 

 latter: neuration of anterior wings always alike in both sexes. 

 Second submarginal cell not petiolate ; marginal cell generally narrowed and 

 pointed at apex, and extending beyond the third sulmiarginal cell; 

 basal segment of abdomen nearly or quite as broad at ajiex as the l)ase 

 of second segment, and rarely constricted. 

 Eyes subemarginate within ; antennae inserted on the middle of the face not 

 far above the clypeus, not approximate; submedian cell of posterior 

 wings as long or longer than the median cell on the externo-medial 

 nervure ; 9 without an enclosure on the sixth dorsal segment. 



Pliilantliiix Fabr. 



Eyes entire; antenna inserted above the middle of the lace and distant 



from tJie clypeus, approximate; submedian cell of posterior wings 



falling far short of the median cell on the externo-medial nervure ; 



9 with a l>road flattened enclosure on the sixth dorsal segment. 



Ai>liilaii<li<»|>M Patton. 

 Second submarginal cell petiolate; marginal cell more or less obtuse at apex 

 and rarely extending beyond the third submarginal cell ; ba.sal seg- 

 ment of abdomen always narrower than the st-cond ; all the segments 



more or less constricted C'orcori«* Latr. 



Third submarginal cell very large, subcjuadrate, scarcely narrowed towards the 

 marginal cell and extending beyond it, and without a sinus between 

 them ; second submarginal cell triangular, .sometimes petiolate in 9 : 

 marginal cell obtusely truncate at apex ; first abdominal segment nar- 

 rowed as in Cerceris; neuration of anterior wings generally di.ssiiuilar 



in the sexes KiK-orooris Cress. 



A m()nogra])h of ihis family was |iul)li>licd in iMi-") , j'roc. f'.iit. 

 Soc. IMiil. V, pp. 85-132) and full descriptions given of the gciu'ra 

 and species then known to occur in oiir fauna, ^[r. Patton has also 

 niiblished interesting and valuable notes on some of the genera and 

 species, describing :i new genus and several species (Proc. Bost. Soc. 



