216 AMERICAN HYMENOPTERA. 



Var. anniilicrus Walsh. Trans. 8t. Louis Acad, iii, 95. 

 % . — The markings of aunulicrus are essentially the same as in 

 dorsalis, except that the thorax and abdomen are black without 

 rufous stains. 



Two specimens, Michigan and New Hampshire. 



Exochus $«olitarius n. sp. 



% . — 6 mm. Head and thorax black ; face, month-parts, spot above and another 

 beneath eyes, tegultp., line beneath and broad line in front, lemon-yellow; legs 

 honey-yellow, with apex of all the femora, broad central annulus on hind tibise. 

 basal segment of hind tarsi, basal half of four anterior tibise and spurs, white; 

 four anterior coxae and trochanters whitish ; posterior tibiae black at base and 

 apex ; antennae brown, reddish beneath ; scape black ; wings hyaline, nervures 

 brown; antei'ior wings wanting; thorax depressed, shining, and but slightly 

 punctured; metathorax with first and second lateral areas united ; flanks of the 

 metathorax in front of the hind coxae a deep ruby-red ; abdomen polished, ru- 

 fous, except basal three- fourths of first segment, which is black; basal half ob- 

 scurely carinate. 



One specimen from Canada. (Type, coll. Amer. Ent. Soc.) 



Exochus pallipes Cress., Proc. Ent. Soc. Phil, iii, 287. 



Exovhus evectus Cress., Trans. Amer. Ent. Soc. iv, 168. 



Exochns albifrons Walsh, Trans. St. Louis Acad, iii, 94. 



Exochiis xnnfhopsis Ashm., Trans. Amer. Ent. Soc. xxiii, 201. 

 f % . — 5-7 mm. This is another variable species where scarcely three have 

 the same color markings; the head is black, with face, except sometimes black 

 central spot, mouth-parts, cheeks beneath and spot Hbove eyes sometimes con- 

 nected by anterior orbital lines, lemon-yellow; thorax varies from entirely black 

 to the whole, except mesonotum, being rufous, or often yellowish white in % ; 

 tegulse, line beneath, broad line or triangular spot in front, at least a transverse 

 line at apex of scutellum and on postscutellum, and usually lateral lines on scu. 

 tellum. white; sometimes the scutellum is entirely red ; abdomen black, some- 

 times narrowly margined at apex of segments v^ith rufous; polished, though dis- 

 tinctly punctured ; carinje rather prominent on the basal two-thirds of the first 

 segment; mesonotum of thorax coarsely punctured; metanotuni completely 

 areolated ; legs vary from rufous to pale honey-yellow; one has the basal two- 

 thirds of posterior tibiae entirely white, but all agree in having the apex of hind 

 tibiae dusky to black and usually in having the apex of the hind tarsal segments 

 dusky; antennae brown, paler toward a})ex, rufous beneath ; wings hyaline, ner- 

 vures and stigma reddish brown. 



Sixteen specimens from Michigan, Illinois, Massachusetts, Con- 

 necticut, North Carolina, Victoria, Vane. I. (Ashmead), Canada 

 (Walsh) and Texas (Cresson). Individuals of this species have 

 been bred from Caccccia fervidana on black oak, C. (■ermivorana on 

 cherry; a Tortrix on hickory and one on poplar. (Type, coll. Amer. 

 Ent. Soc.) 



Var. pliiralis Cress., Proc. Ent. Soc. Phil, iii, 286. 



1i . — DitiVrs fiom paUipes % only by having the abdominal segments 2-4 with 



