TRIGONALID WASPS — TOWNES 297 



with a broad weak median notch ; frons only wealdy elevated next to 

 the upper inner margin of the antennal foramen. 



There is a single Nearctic species, which is moderately common in 

 the Eastern States. 



Orthogonalys pulchella (Cresson) 



Trigonalys ptilchellus Cresson, Proc. Ent. Soc. Philadelphia, vol. 6, p. 351, 1867. 



Type: Male, West Virginia (lost). 

 Tapinogonalos 'pulchella Schulz, in Wytsraan, Genera insectorum, fasc. 61, pi. 2, 



figs. 56-58 (colored), 1907. 



Male: Forewing about 8 mm. long. Colored wdth black, pale 

 yellow, and fulvous, to mimic the Taxonus pallidicornis — Cratichne- 

 umon signatipes type of coloration. Head and mouthparts yellow, 

 the occiput, vertex, and median part of frons black; vertex with a pair 

 of yellow spots behind the ocelli; antenna black, its scape yellowish 

 beneath and brownish above, its flagellum with a broad whitish post- 

 median band; thorax blackish above with conspicuous yellow mark- 

 ings, yellowish laterally with black bands along the sutures separating 

 off the yellow areas, mostly yellowish below, the mesosternum mostly 

 fulvous; wings hyaline; legs fulvous, the trochanters and much of the 

 coxae pale yellow; abdomen fulvous with a pair of fuscous areas basally 

 on the second tergite and often similar areas or transverse subbasal 

 fuscous bands on several of the following tergites. 



Female: Forewing about 8.5 mm. long. Colored like the male but 

 with the yellow markings tending to be paler, almost white, the 

 fuscous markings on the abdomen tending to be more as crossbands, 

 and each of abdominal tergites 1 to 5 usually with a lateral white 

 blotch. 



Specimens: 27 cfcf, 39 99 from: District of Columbia; New 

 Jersey (Moorestown) ; Maine (Paris) ; Maryland (Bowie, Cabin John, 

 Glen Echo, Lock Raven, Takoma Park, and Plummers Island); 

 Massachusetts (Chester); New York (Farmingdale, Ithaca, Ludlow- 

 ville, Niagara Falls, and Taughannock) ; Pennsylvania (Enola and 

 Highspire) ; Rhode Island (Westerly) ; and Virginia (Alexandria, Dead 

 Run, Falls Chm'ch, Great Falls, and Rosslyn). 



Males occur mostly in June and early July, their earliest and latest 

 dates of capture being May 25 at Plummers Island, Md., and July 

 21 at Ithaca, N. Y. Females occur mostly from mid-June to mid- 

 August. Their extreme dates are June 7 at Plummers Island, Md., 

 and Aug. 23 at Niagara Falls, N. Y. This seasonal distribution indi- 

 cates a single generation per year. There is a rearing record by 

 Bischoff (Berliner Ent. Zeitschr., vol. 54, p. 76, 1909) from Zenillia 

 lobeliae (Larvaevoridae), which was parasitic on Acronicta lobeliae 

 (Noctuidae). 



