ART. 1. NOETH AMERICAN SAWFLIES ROHWER. 35 



ginate ; the lobes very obtuse ; supraclypeal foveae deep, nearly circu- 

 lar in outline; middle fovea elongate, oval in outline, with sloping 

 walls, breaking through the frontal crest; lower walls of the ocellar 

 basin rounded; lateral walls nearly obsolete; a shallow, poorly de- 

 fined depression in front of the anterior ocellus; antennal furrows 

 poorly defined below the ocelli; postckcellar area gently convex, 

 sharply defined laterally with an elongate fovea in the anterior mid- 

 dle; postocellar furrow wanting; antenna rather long and sharply 

 tapering, the third joint slightly shorter than the fourth and with a 

 projection at the base beneath apical joint distinctly longer than the 

 preceding; stigma rather narrow, broader at base, gradually taper- 

 ing to the apex; first intercubitus obsolescent; second and third 

 cubital cells subequal on the radius ; radiellan cell with a very short 

 appendage; sheath straight above, obtuse apically, and tapering 

 from the broad base. Black; trochanters, four anterior tibiae and 

 tarsi, the posterior tibiae except apical third and the four basal joints 

 of the posterior tarsi, white; wings fuliginous basally, subhyaline 

 beyond the apex of the stigma. 



Type locality. — Great Falls, Virginia. 



Described from one female reared from a larva collected on Pi'u- 

 nus serotina by S. A. Eohwer, and recorded under Bureau of Ento- 

 mology number Hopk. IJ. S. 10718. This species was also collected 

 and reared from the same host at Newington, Fairfax County, Vir- 

 ginia, by S. A, Eohwer. 



Type.— Csit. No. 21596, U.S.N.M. 



Larva. — Length, last stage, 11 mm. Black above vv^ith lower part 

 of latus, legs, and beneath, white ; head with usual black markings. 



Pupa. — The antennae of the pupa, on reaching their full length, 

 Avere composed of eighteen joints, the division between the regular 

 nine joints more strongly marked. 



Host. — Prunus serotina. 



Seasonal History. — These larvae are solitary feeders from the un- 

 der surface of the leaves, the younger larvae skeletonizing, the more 

 mature larvae eating holes. A larva collected June 27, spun cocoons 

 June 30, pupated July 2, and emerged as an adult July 16. 



PRIOPHORUS PLESIUS Rohwer, new spoeiM. 

 Figure 4. 



Female. — Length 5 mm.; length' of the antenna 3.75 mm. Clypeus 

 strongly convex; the apical margin rather deeply, subangulatel}- 

 emarginate; the lobes broad, triangular in outline; the apical mar- 

 gin acute; supraclypeal fovese deep, circular in outline; middle 

 fovea elongate, deep, with sloping walls, breaking through the 

 frontal crest; lower walls of ocellar ba^in rounded: lateral walls 



