﻿NE ARCTIC SPECIES OF GASTERUPTIIDAE — TOWNES 105 



(Beaumont and Lanicl); Rhode Island (Westerly); and Virginia 

 (Great Falls). Collection dates fall mostly in June and July. Those 

 outside these months are: May 15 at Charter Oak, Pa.; May 29 and 

 30 at Bowie, Md.; and August 1 and 29 at Lyme, Conn. Some of 

 the above specimens were reared as follows: 9, Charter Oak, Pa., 

 July 1, 1917, F. C. Craighead, from Aiioylodera proxima in Fagus; 

 9, Charter Oak, Pa., May 15, 1915, F. C. Craighead, from Anoplodera 

 mutabilis in Alnus; 9, Inglenook, Pa., July 1, 1915, F. C. Craighead, 

 from Anoplodera rubrica in Tsuga; 9, Harrisburg, Pa., June 4, 1913, 

 F. C. Craighead, from Anoplodera rubrica in Carpinus; 9, Lyme, 

 Conn., August 29, 1916, A. B. Champlain, from Ostrya. I have twice 

 collected the species on dead branches of Carpinus. 



This species occurs from Prince Edward Island south to Virginia 

 and west to Manitoba. It seems characteristic of damp bottomland 

 woods and frequently parasitizes lepturines in Carpinus, a tree char- 

 acteristic of those habitats. 



15. AULACOSTETHUS OCCIDENTALIS (Cresson), new combination 



Figure 16, i 



Forewing strongly suffused with brownish; temple full; ovipositor 

 sheath about 1.2 as long as the forewing . 



Forewing about 11 mm. long; as seen from above, head about 0.74 

 as long as wide; top of head rather dull, with fine close punctures; 

 temple (fig. 16, i) strongly convex and fuller than in A.Joxleei; lateral 

 lobe of mesoscutum weakly wrinkled all over; ovipositor sheath about 

 1.2 as long as the forewing. Otherwise structurally similar to A. 

 joxleei. 



Female: Colored like that of A. joxleei except as follows: Head 

 varying from entirely ferruginous to entirely black, but never with 

 the small blackish triangle between the eye and the lateral ocellus 

 that is so characteristic of A. joxleei; thorax entirely black to entirely 

 ferruginous; legs often more or less blackish; and forewing with the 

 apical and substigmal dark spots usually smaller and paler than in 

 A. joxleei. 



Male: Colored like that of A. joxleei except as follows: Head, except 

 clypeus, and thorax entirely black; apical and substigmal dark wing 

 marks usually smaller and paler; first and second tergites entirely 

 ferruginous or marked similar to those of A. joxleei; legs sometimes 

 more or less blackish. 



This species occurs in the Canadian Zone from the Pacific coast to 

 the Rocky Mountains, with one subspecies {A. occidentalis lavatus) in 

 British Columbia, Washington, Oregon, and California and the other 

 occurring to the east. They are weakly separable in the female by 

 the amount of black on the thorax. I do not find good differences in 

 the males. 



