AMERICAN IIYMENOPTERA. 



219 



legs below the knees and tlie tarsi white, the femora chesnut-red 

 Westfield, Mass. 

 Conn., Mass. 2^,2?. 



The under winlr^^ have the lanceolate cell extending to the margin 

 of the wing, as in fig. 2 a, and all the outer marginal cells complete 

 in the males ; with the females these outer ner- 

 vures are present, but are broken in several 

 places. 



This insect differs much from the other spe- 

 cies of Strongyhgaster in its antenna?, its short- 

 ened abdomen, and in its under wing lanceolate 

 cell, which in this genus, as well as Allanfus 

 and Tenthi-edo, is formed as in fig. 1 a. The cell 

 is usually shorter in Selandria, Macropliya and 

 Taxonus and does not reach the cross nervure of 

 the brachial cell above. It differs from Perl- 

 neiu-a, Hartig, in having its upper wing lanceo- 

 late cell with an oblique cross-line, and its un- 

 der wing with an inner and outer apical cell. 



Fig. 1. Typical under wing of AUantus, Strongylog aster and Tcn- 

 thredo. 



Fig. 2. Under wing of Strongylogaster pinguis % . 

 Fig. 3. Under wing of S Strongylogaster 7nellosus,apicalis,epicera, 

 and of Perincia-a, Hartig. 



Tribe. 2. 

 9. S. tacitus. 



Allantus tacitus, Say, Harris Cat. 



Norton, Bost. Jour. vii. 1860, 246, 20. 

 Strongylogaster tacitus, Norton, Bost. Proc. ix. 120. 

 Black; abdomen rufous; wings violaceous. Length 0.30 — .34. Br. wings 

 0.60— .68 incli. 



% . — Body rather stout, obtusely rounded at apex ; antennre moder- 

 ate, flattened from base, third and fourth joints equal ; eyes not as 

 prominent as in Tribe 1 ; face and pleura coarsely punctured ; nasus 

 not deeply emarginate, face black; basal membrane black, abdomen 

 chesnut-red; legs black, tips of anterior femora and base of tibife pice- 

 ous; wings violaceous, subopaque, under wings with two middle cells. 



9 , — The female sometimes has a faint rufous tinge on the inner or- 

 bits near the antennae; basal joint of palpi rufous above; reuiaiiider 

 piceous; tegulae piceous; abdomen paler than in male ; anterior tibi;e 

 and tarsi piceous. 



Mass., (Harris Coll,). Conn., N. Y., Canada. 



