﻿NEARCTIC SPECIES OF GASTERUPTIIDAE — TOWNES 109 



18. AULACOSTETHUS BILOBATU9 (ProTancher), new combination 



Aulacus bilobatus Provancher, Nat. Can., vol. 10, p. 237, 1878; Faune p. 247. 

 Type: cf, Quebec (Quebec). 



Tarsal claws each with two teeth; propleurum punctate; apical half of 

 9 abdomen black. 



Forewing about 8 mm. long; frons with small close punctures, 

 medially the punctures sparse; top of head with moderately close, fine 

 punctures, separated by about 0.5 the length of their setae; propleurum 

 with moderately close, weak, medium-sized punctures; pronotum 

 wrinlded, somewhat rugosopunctate around the edges; hind coxa above 

 finely transversely rugosopunctate or wrinkled; ovipositor sheath about 

 1 .5 as long as the forewing. Other structural features as in A. rufitarsis. 



Black. Fore and middle tibiae and tarsi and hind tarsi bro^^^lish; 

 fore and middle femora more or less tinged with brown; abdomen 

 ferruginous, its apical half and base of first tergite black. In males 

 the abdomen is often mostly black, with only the first two tergites 

 largely ferruginous. 



Specimens. — Many males and females from Michigan (Point 

 Abaye); New Hampshire (Durham); New Jersey (Alpine); New 

 York (Greene County, Ithaca, and Slaterville) ; Nova Scotia; 

 North Carolina (Tryon) ; Ohio (Cleveland and Mentor) ; Ontario 

 (Footes Bay, Ottawa, and Waubamic); Pennsylvania (Hummels- 

 town and Hunters Run); West Virginia (Cairo); and Wisconsin 

 (Menominee Indian Reservation and Neopit) . Dates of capture are 

 rather evenly distributed from June 14 to August 13, wnth four records 

 from May 13 to May 22, apparently from indoor rearings. Records 

 from eight localities state that the specimens were reared from Tsuga 

 canadensis, and from two additional localities that the specimens were 

 collected on this tree. Six of the eight rearing records give the host 

 as Melanophila fulvoguttata (Buprestidae) , one as Melanophila, and 

 the remaining record as "hemlock borer." 



Tliis species is parasitic on Melanophila fulvoguttata (Buprestidae) 

 infesting Tsuga canadensis and seems to have the same range as this 

 tree. It has been collected from Nova Scotia to North Carolina and 

 west to Wisconsin. 



19. AULACOSTETHUS RUFITARSIS (Cresson), new combination 



Aulacus rufitarsis Cresson, Proc. Ent. Soc. Philadelphia, vol. 3, p. 134, 1864. 



Type: 9, Colorado (Philadelphia). 

 Aulacus abdominalis Cresson, Trans. Amer. Ent. Soc, vol. 8, proc. v, 1880. 



Type: ?, Georgia (lost). 

 Aulacus erythrogaster Kieffer, Arkiv Zool., vol. 1, p. 561, 1904. Types: cf 9 , 



Nevada (Stockholm). 

 Odontaulacus spinosipes Kieffer, Ann. Soc. Ent. France, vol. 79, p. 79, 1910. 



Type: 9, Salida, Colo. (Claremont, Calif.). (New synonymy.) 



Tarsal claws each with two teeth; hind femur blackish; propleurum 

 not distinctly punctate. 



