No. 22.] HYMENOPTERA OF CONNECTICUT. 343 



of abdomen, mostly black; antennae mostly brown; mos.t 

 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 mm clarus 



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 brullei 



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, PI. 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 interrogations] . 



