MONOGRAPH OF THE NORTH AMKRICAN PROCTOTRYPID.E. 191 

 Prosacantha nana, h)). nov. 



5. Length, 1""". Black; thorax finely rujjoso, subopaque, the 

 scntellnm smooth, shining, faintly punctate; hea<l smooth, sliining, 

 the face polished, very simrsely, finely punctate above. Mandibles 

 black. AntennjB 12-Jointed, black, the pedicel two-thirds the length 

 of the first fuuiclar joint, the second fuuiclar joint slightly shorter than 

 the first, the third and fourth, minute, transverse, club as long as the 

 funicle, excluding the pedicel, the joints transverse. Postscutellar 

 spine very minute. Wings subfuscous. Legs black, the tarsi fuscous. 

 Abdomen longer than the head and thorax together, polished, the first 

 segment and the se( ond basally, striated. 



Habitat. — Utah Lake, Utah. 



Type in Coll. Ashmead. 



Described from a single specimen, received from Mr. B. A. Schwarz. 



Prosacantha caraborum, bx>. iiov. Kiley. 

 (PI. viii, Fig. 4.9.) 



" 9 . Length, 1.8""". Black, shining, the thorax finely rugulose, the 

 scutellum almost smooth. Head transverse, thrice as wide as long, the 

 occiput longitudinally striated, the face smooth with a delicate carina 

 extending from the front ocellus to the base of the antennae ; lower part 

 of orbits and cheeks with strijc converging toward the mouth; mandi- 

 bles pale rufous, deeply bifid at tips; antenme lli-jointed, about as 

 long as the body, slender, dark brown or bla^^k, the scape a little pale 

 at extreme base; pedicel ab(mt as hmg as the third funiciilar joint; the 

 first and second funicular joints ehnigate, equal, about twice as long as 

 the pedicel, the fourth subequal with the third ; club G-jointed, slender, 

 long, fusiform. Metanotuni with silvery pubescence; teguhe black; 

 wings hyaline, the venation pale brownish-yellow. Legs reddish-yel- 

 low, the coxje bas'^lly and the middle and posterior tibitB and tarsi, 

 fuscous. Abdomen as long as the hea<l and thorax together, shining, 

 with a sparse, fine pubescence toward the apex; the first three seg- 

 ments longitudinally striated. 



" S . Smaller (L6'""') and leniarkable for the very long, filiform, 

 hairy antennjc which are fully twice the length of the whole insect; 

 they are black, the scai^ rufous, the pedicel round; the flagellar joints 

 all exceedingly long and slender, longer than the scape, th", third being 

 angul.arly produced toward the base." — [From RileifH MS.^ 



Habitat. — Washington, D. C, and Arlington, Va. 



Types in National Museum and Coll. Ashmead. 



Reared by Dr. Riley in June, 1884, from the eggs of a Carabiu '«, 

 {(JItlwniHs impuncti/rons), and also taken by me in Virginia by , 



