NO. 2296. CERTAIN GENERA OF ICHI\iEUMON-FLIES—CUSHMAN. 331 



The three female paratypes have the first tergite in the middle and 

 the others more or less at base piceous. 



Genus THYMARIS (Foerster) Erischke. 



Only one North American species has been referred to this genus. 

 This is Tliymaris sling eiiaimnna Ashmead. It does not belong to 

 the genus but is a Campoplegine synonymous with Diodes ohliter- 

 atus (Cresson). 



The following new species is apparently the first North American 

 species truly referable to the genus. 



THYMARIS AMERICANUS, new species. 



In Schmiedelcnecht's key to the European species of Tliymaris 

 runs to coUaris Thomson and agrees fairly well with the description, 

 but lacks the brown color on the metapleura. The description of 

 collaris is, however, based entirely on color and size, and is so brief 

 that it is inadvisable to determine an American species as collaris, 

 especially without a specimen of that species for comparison. 



Female. — Length, 4 mm.; antennae, 4 mm. 



Head poUshed, weakly, sparsely punctate, more densely and 

 strongly so on face and frons; temples narrow, convex; clypeus 

 finely punctate; thorax sparsely punctate, more strongly and densely 

 so on disk of mesoscutum and metapleura; propodeum punctate 

 basally transversely rugulose apically, areola and petiolar area equal 

 in length, the former hexagonal with costulae at its basal third; 

 hind basitarsus very nearly as long as remaining joints combined; 

 second abscissa of cubitus barely longer than intercubitus; first 

 three tergites longitudinally striate, the third more weakly so. 



Black; clypeus and mandibles yellow; palpi white; antennae 

 black, flavous at base, flagellar joints 9-12 white; thorax black, 

 with pronotum laterally, mesopleura in dorso-anterior corner, disk 

 of mesoscutum and scutellum reddish; tegulae stramineous; legs 

 stramineous, front and middle coxae and trochanters white, hind 

 tibiae slightly infuscate apically and subbasally; abdomen black 

 with apices of first three tergites reddish. 



Male. — Length, 4 mm.; antennae, 5 mm. 



Differs from female ])rincipaily as follows: Head wider and more 

 strongly convex behind eyes; antennae black without annulus and 

 with only scape and pedicel yellowish ; pro thorax mostly black, meso- 

 pleura only obsoletely red dorso-anteriorly; mesoscutum and scu- 

 tellum entirely black; hind tibiae and tarsi generally infuscate. 



Four female paratypes show color variation both ways from the 

 type, Paratypes a and h have the red of the thorax brighter and 

 more extensive, the discal spot on mesoscutum of a embracing most 



