ART. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 35 



very distinct; head white with only occiput and middle of vertex 

 and frons and teeth of mandibles black; scape white, flagellum pale 

 reddish, fuscous above toward base; thorax pale testaceous with the 

 white pattern less distinct than in female, some of the markings 

 usually absent; legs paler with most of front and middle legs and 

 hind tarsus stramineous; tergites 2 and 3 blackish at base. 



Type-locality. — Pyziton, Clay County, Ala. 



Type.—Q^t. No. 40589, U.S.N.M. 



Five females and ten males, all but three collected by H. H. Smith 

 at Pj'ziton, Coleta, and Langdale, Ala. ; one male from Cabin John, 

 Md., August 6, 1917, R. M. Fouts; one male. Chevy Chase, Md., H. H. 

 Smith ; one female, Rockaway Beach, Long Island, F. H. Chittenden. 



The New York specimen has the black of the head and thorax 

 more extensive, the malar space and a line on each side of middle of 

 face blackish red. 



DIAPETIMORPHA ACADIA, new species 



In spite of its small size and red color this is of all the species most 

 closely related to the genotype in general form and structure and 

 also in the strong color antigeny between the sexes. 



Female- — Length, 7-8 mm. ; type, 7.5 mm. 



Head very finely and weakly punctuate coriaceous, face densely 

 finely punctate opaque; frons with a median carina; temples con- 

 vexly sloping, not nearly perpendicular to body axis ; cheeks convex, 

 occipital carina not sinuate nor prominent below; eyes very slightly 

 convergent below, not at all sinuate within; malar space nearly as 

 long as basal width of mandible ; teeth of mandibles subequal ; an- 

 tennae nearly as long as body, first three joints of flagellum long and 

 slender, successively shorter, fourth a little more than half as long 

 as third, others very gradually shorter. Thorax dorsally and ven- 

 trally shining, finely and rather sparsely punctate, laterall}' con- 

 fluently punctate; pronotum striate in impression; notauli shortly 

 distinct ; scutellum margined only at base, subpolished ; propodeum 

 bicarinate, the apophyses not high, basal areas shining, sparsely 

 punctate, middle and apical areas reticulate rugose, spiracles small 

 oval ; areolet fully as long as high ; cubitus obsolete beyond recurrent ; 

 nervulus interstitial or nearly; nervellus reclivous, broken at about 

 the middle; legs slender, front tibia not inflated. Abdomen fusi- 

 form, tergites 2 to 6 very broad and strongly folded, their spiracles 

 very far from lateral margin ; first tergite polished, postpetiole rather 

 broad but merging gradually into the petiole; tergites 2-6 opaque 

 coriaceous, apical tergites polished; sheath as long as abdomen ex- 

 clusive of first tergite; ovipositor rather stout, compressed, sagittate 

 at apex. 



