No. 22.] HYMENOPTERA OF CONNECTICUT. 343 



of abdomen, mostly black; antennae mostly brown; most 

 of remaining integument reddish; some of segments of 

 basal third of abdomen with an apical yellowish or whitish 



band. Length 6-8 mm. thoracicus 



Scutel of female white; antennae of male without a white 

 annulus; mostly metallic blue. Length 12-13 ^^ clams 



°P. (Apaeleticus) thoracicus Cresson. 

 P. clarus Cresson. 



Trogus Gravenhorst. 



Key to Species. 



1. Species mostly black; antennae orange, with a fuscous or 



nearly fuscous tip 2 



Species mostly reddish vulpinus 



2. Petiole produced above so as to appear rather pyramidal, and 



without a median longitudinal channel bruUei 



Petiole simply rather convex above, and with a shallow me- 

 dian longitudinal channel obsidianator 



T. (Psilomastix) vulpinus Gravenhorst. T. exesorius 

 Brulle. PI. ix, Fig. 8. 



Parasite of swallow-tail butterflies (Papilio). New Haven, 

 20 June, 1902 (E. J. S. M.), 3 August, 1896 (W. C. Sturgis), 

 26 August, 1902 (B. H. W.) ; Westville, 2 June, 1901 (W. E. B.). 

 *T. (Automalus) brullei Cresson. 



Hosts: larvae of Dolba hylceus and Smerinthus astylus. 

 Woodbridge, 26 August, 1906, Stafford, 24 August, 1905 

 (W. E. B.). 



°T. obsidianator Brulle. 



Parasitic on Papilio polyxenes. 



Hoplismenus Gravenhorst. 



H. morulus Say. Howard, Insect Book, PI. x. Fig. 29 ; Scud- 

 der. Butterflies of New England, Vol. iii, PL 88, Fig. 9. 



Length 16 mm. ; conspicuous on account of being almost en- 

 tirely black; tibiae and tarsi yellowish stramineous; fore coxae 

 with a yellow mark in front ; scape in male anteriorly more or 

 less yellow, face beneath antennae in male yellow ; female antennae 

 with a yellow annulus ; wings fuscous. 



The hosts of this American species are the cosmopolitan 

 mourning-cloak butterfly [{Vanessa) Euvanessa antiopa], and 

 the question-sign butterfly [ ( Grapta) Polygonia interrogationis] . 



