118 OENERA OF HYMKNOKfRRA. 



Wiwhington Territory. Of Xi/m)n seventeen sjxicies have been 

 ib(;d, from all parts of the country, but nowhere coninioji. 



from 

 (le8crib(;d, from 



Family PHILANTHIDiE. 



This 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 tegulae ; 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 sej)arated in tlie follownig manner : 



Table of Genera. 



Third submarijiual cell much narrowed towards the marginal, leaving a hroad 

 deeji sinus hetween them, the former never extending beyond the 

 latter; neuratiun of anterior wings always alike^ in both sexes. 

 ^■<j<;ond submarginal cell not petiolate : marginal cell generally narrowed and 

 pointed at aj)e.\, and extending lieyoiid the third .su))marginal cell; 

 bas^il segment of abdomen nearly or quite as broad at apex as the base 

 of second segment, and rarely constricted. 

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

 far above the clyi)eus, net approximate; submedian cell of posterior 

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

 nervure ; 9 without an enclosi"'e tm the sixth dorsiil segment. 



Pliilantliim Fabr. 



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



from tlie clypeus, approximate; submedian <'ell of posterior wings 



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



9 *vith a broad flattened enclosure on the sixth dorsal segment. 



.4philanthop8 Patten. 

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

 and rarely extending beyond the third submarginal cell ; basal seg- 

 ment of abdomen always narrower than the second ; all the segments 



more or less constricted Cerceris Latr. 



Third submarginal cell very large, subquad.ate, 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 ; fii-st abdominal segment nar- 

 rowed as in Cerceris; neuration of anterior wings generally dis.similar 

 in the .sexes Eucerceris Cress. 



A monograph of this family was published in 1865 ( Proc. Ent. 



Soc. Phil, v, pp. 85-132) and full descriptions given of the genera 



and species then known to occur in our fauna. Mr. Patton has also 



published interesting and valuable notes on some of the genera and 



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



