26 PROCEEDINGS OF THE ISTATIONAL MUSEUM. vol.60. 



12. Frontal crest not broken by median fovea pruni Rohwer. 



Frontal crest distinctly broken by the deep middle fovea__aequalis (Norton). 



13. A distinct depression in front of the anterior ocellus betulae Rohwer. 



No depression In front of the anterior ocellus salicivoms Rohwer. 



KEY TO THE LARVAE. 



A. Larvae feeding on 8alix salicivorus Rohwer. 



B. Larvae feeding on Crataegus crataegi Rohwer. 



Larvae feeding on Prunus serotina pruni Rohwer. 



plesius Rohwer. 

 virginianus Rohwer. 



Larvae feeding on Betula populifolia betulae Rohwer. 



Larvae feeding on Ruhus mbi Rohwer. 



Larvae feeding on Alnus solitaris (Dyar). 



On characteristics other than host plant these larvae can not be separated 

 specifically, however, differences in the extent of coloration of the head divides 

 those larvae available for study into the following two species groups: 



A. Head with a small (not reaching more than half way to edge of cranium) 



black spot surrounding eye ; figure 56 salicivorus Rohwer. 



B. Head with a large (reaching almost to edge of cranium) black spot surround- 



ing eye; figure 55 crataegi Rohwer. 



pruni Rohwer. 



betulae Rohwer. 



virginianus Rohwer. 



solitaris (Dyar.) 



PRIOPHORUS CRATAEGI Rohwer, new species. 



Female. — Length, 5 mm. ; length of the antenna, 4.5 mm. Clypeus 

 shining with sparse, setigerous punctures, basal middle strongly con- 

 vex, the anterior margin broadly, shallowly, arcuately emarginate, 

 lobes sharply pointed; supraclypeal fovea deep, punctiform; middle 

 fovea large nearly circular in outline with sharply sloping walls; 

 ocellar basin completely defined, lower walls sharp, keel-like and 

 broken by the middle fovea ; the lateral walls linelike ; antennal fur- 

 rows poorly defined; postocellar area sharply defined laterally, con- 

 vex, parted by a furrow medianly ; postocellar furrow obsolete ; posto- 

 cellar line subequal with the ocellocular line ; antenna sharply taper- 

 ing, the third joint distinctly shorter than the fourth, the apical joint 

 slightly longer than the preceding; stigma broadly rounded below, 

 obliquely truncate apically; first intercubitus obsolescent; third 

 cubital slightly longer than the second on the radius; the radiellan 

 cell without an appendage; sheath broad, straight above, obliquely 

 truncate apically, then sharply tapering to the base. Black; trochan- 

 ters, four anterior tibiae and tarsi (the apical joints of the tarsi are 

 infuscated), the basal two-thirds of the posterior tibiae and the three 

 basal joints of the hind tarsi white; wings subhyaline, with a dusky 

 band below the stigma ; venation dark brown. 



Type locality. — East River, Connecticut. 



