JOURNAL 



OF THE 



Jlfk Sork 6!n1foraologirfll jSoriFtg. 



Vol. V. SEPTEMBER, 1897. No. 3. 



NEW SPECIES OF TENTHREDO. 



By Alex. D. MacGillivray, Ithaca, N. Y. 



The species described below are arranged analytically so that the 

 labor of reading descriptions in determining specimens may be reduced 

 to a minimum. The grouping is the same as that used by Norton in the 

 Transactions of the American Entomological Society and consequently 

 can be compared directly with it. 



1. Antennffi wholly or in part pale ^ 



Antennx wholly black 5 



2. Antennje wholly pale 3 



Antenna in part black 4 



3. Abdomen black at base and rufous at apex, with the basal plates rufous. 



redimaculus MacG. 

 Abdomen entirely black. 9 .—Black, with the following parts whitish-fuscous : 

 the labrum, the base of the mandibles, the apical half of the front femora be- 

 neath, and a square spot on the sides of the basal plates ; the antennae pale 

 luteous beyond the second segment ; the clypeus squarely emarginate ; the 

 third segment of the antennae one-fourth longer than the fourth ; wings hya- 

 line, very slightly infuscated ; the veins, including the costa and the stigma, 

 black. Length, 12.5 mm. Habitat.— Jay, Vermont (A. P. Morse.) 



dubitatus, sp. nov, 



4. Abdomen rufous beyond the basal plates basilaris Prov. 



Abdomen rufous beyond the third segment bilineatus MacG. 



5. Head more or less yellow above the base of the antenna 6 



Head black above the base of the antennae ^2 



6. Abdomen wholly or in part yellow 7 



Abdomen wholly or in part rufous 9 



7. Pectus pale * 



Pectus black. 9 .—Black, with the following parts yellow : the clypeus, the 



labrum, the mandibles except at apex, a triangular spot between and beneath 

 the antenna, the lower half of the cheeks, an ovate spot above the base of 

 each antenna, the inner margin of the eyes (interrupted opposite the bases 



