THE CANADIAN ENTOMOLOGIST 59 



the lateral edges above the eyes pointed. Mesothorax crossed l)\- an oblique 

 lateral ridge terminating in a small tubercle representing the subdorsal spine 

 of the larval stage; wing sheaths in the thoracic area bordered by a sharp irregular 

 ridge. Transverse ridges cross the dorsal anterior portion of abdominal seg- 

 ments I\-\TI, the spines of the larval stage being marked on them by small 

 tubercles; remaining segments with dorsal and subdorsal rows of small warts, 

 distinctly orange-tinged. Spiracles pale orange. In the intersegmental area traces 

 of the subdorsal and subspiracular lines of the larva maybe found, but these are 

 not distinguishable on the general surface of the pupa. Wing sheaths with the 

 brown veining forming more or less dark patches centrally near the antennal 

 sheath and at the apex, adjoining abdominal segments I— III; an apical double 

 row of raised white dots, about 1 mm. apart. Antennal sheath purplish with a 

 row of raised white dots extending the entire length. Width of truncate apex 

 2'/2 mm. Length from apex to cremaster abdominalh' 10 mm. Width of 

 mesothorax .j'/2 rnm. Breadth at apex of wing cases 41/2 mm. 



Explanation of Plate I. 



Fig. 1. — Phvciodes batesi Keak, 9. 



Fig. 2.— ' " •' " cf . 



Fig. 3. — " " " ? , underside. 



g. 4. — cf, 



Fig. 5. — " tharos Drury. cT, 



Fa •  • '  ' 71 " 



ig. 6.— cf, 



F_ 11 t. K ^ ii 



Ig- '•— ^. 



Fig. 8. — Pupa of Phyciodes batesi, dorsal view. 

 Fig. 9. — " " " " lateral view. 



Fi<\ nil 11 II .!• 



Ig. 10. — ventral view. 



TWO NEW SPECIES OF PLATYCAMPUS— 

 (HYMEXOPTERA TENTHREDIXID.E).* 



BY ALEX. D. MaCGILLIVRAY, 



I niversity of Illinois, Urbana, IH. 



The genus Platycampus contains four species, americamis Marlatt from 

 New York and New Hampshire and three western species, smiihi Rohwer and 

 albosiigmus Rohwer from Colorado and juniper i Rohwer from New Mexico. 

 To these are now added another species from New Mexico and one from British 

 Columbia. The following table, in which the species of Rohwer are placed 

 from his descriptions, will serve for their discrimination: — 



a. Head and thorax wholly or in great part reddish-yellow 

 b. Clypeus broadly shallowly emarginate, almost truncate, 

 c. Head wholly or for the most part reddish-yellow 

 d. Frontal crest strongly notched at middle; median fovea shallow, 

 walls sloping: ocellar basin with rounded walls; antennal seg- 

 ments enlarged at distal end, third segment longest; stigma 

 broad, not strongly tapering to distal end; colour reddish-yellow 

 with the following parts white: clypeus, la brum. mandibles , 



*Cor.iributior.s from the Entomological Laboratories cf the L'niversity of Illinoi.s, Xo. t)3. 

 March, 1920 



