174 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BulL 



Macrocephus Schlechtendal. 

 C M. bicinctus (Provancher). Cephus bicinctus Provancher. 

 Body black, with the cheeks, a small spot on each side of the 

 vertex, a spot on the sides of the metathorax, and the apex of the 

 third and fifth abdominal tergites, white ; tibise and tarsi brown- 

 ish ; wings hyaline. Length 12 mm. 



Trachelus Jurine. 

 T. tabidus (Fabricius). Sirex tabidus Fabricius. 

 Body black, with the mandibles except at apex, front margin 

 of the clypeus, the front legs beyond the middle of the femora in 

 great part, a band on each side of the abdomen, and a spot at the 

 apex of the fifth and sixth sternites, yellow; wings somewhat in- 

 fu seated. Length 9 mm. 



Cephus Latreille. 



C. graenicheri Ashmead. 



Abdominal tergites five and six with their apical three-fourths 

 broadly yellow ; body black, with the mandibles except at apex, the 

 clypeus, cheeks, palpi, two spots beneath the wings, the legs ex- 

 cept the trochanters and tips of the tarsi, a large spot on each 

 side of the second abdominal tergite, practically the whole of the 

 third tergite, a spot on each side and on the dorsum of the fourth, 

 three-fourths of the apex of the fifth and sixth and the apex of 

 the last segment, yellow ; wings yellowish hyaline ; saw-guides 

 truncate at apex. Length 11 mm. 



C. pygmaeus Linnaeus. Howard, Insect Book, p. JO, Fig. 42. 

 Fifth abdominal tergite with its, apical half and the apical mar- 

 gin of the sixth, yellow ; body in female black, with the mandibles 

 at base, the palpi, the legs beyond the knees, always more or less 

 infuscated, the apical half of the third and fourth abdominal ter- 

 gites, a spot at middle of the apex of the sixth, and the apical 

 margin of the last segment, yellow ; wings hyaline ; saw-guides 

 broadly rounded at apex. Male differs in having the clypeus, the 

 cheeks, the coxae, the trochanters and femora beneath, and a spot 

 on the side of the second and fourth abdominal segments, yellow ; 

 length 9 mm. Larvae infest the stems of wheat. 



