No. 22.'] HYMENOPTERA OF CONNECTICUT. 33 



2. Anterior tibiae with a lateral spur before the apex 3 



Anterior tibiae without a lateral spur before the apex 4 



3. Hind margin of posterior orbits without a carina 



Acantholyda p. 33 

 Hind margin of posterior orbits with a distinct, fine carina 



Itycorsia p. 33 



4. Front wings with medio-cubital cross-vein joined to media 



distinctly beyond its point of separation from radius 



Cephaleia p. 35 

 Front wings with medio-cubital cross-vein joined to media 

 at its point of separation from radius Caenolyda p. 36 



5. Front wings with free part of Sci present, cells C and Sci 



distinct 6 



Front wings with free part of Sci wanting so that cells C 

 and Sci are united Neurotoma p. 37 



6. Antennae with third segment not or scarcely longer than 



fourth, at least always shorter than segments four and five 



united Pamphilius p. 37 



Antennae with third segment as long as or longer than seg- 

 ments four and five united Anoplolyda p. 39 



Acantholyda Costa. 



°A. marginiventris (Cresson). 



Tergum black, with a narrow lateral white or pinkish 

 margin ; antennas black ; legs black, except the anterior tibiae in 

 front ; head black with the clypeus white ; a spot between the base 

 of the antenna and the eye, a pair of spots in front of the ocelli, 

 a pair of lunate marks behind the ocelli, a narrow band from the 

 eyes to the occiput, and the outer orbits, white; a triangular 

 spot on the median lobes of the mesonotum, white. Length 15 

 mm. 



°A. bicolorata (Norton). 



Tergum honey yellow, with the two apical segments black ; 

 antennae black; legs black; head brown, with a spot at the base 

 of each antenna, a triangular spot above each eye, one about 

 the ocelli, and a large spot on the vertex, black. Length 

 12 mm. 



Itycorsia Konow. 

 Key to Species. 



I. Pleurae entirely black 2 



Pleurae either with a broad oblique pale spot or entirely pale 3 



3 



