ICHNEUMONIDyE. 113 



vate, opaque at base, sliiniiia; beyond the second segment; apical margin of the 

 second and following segments yellowish-white: first and second segments lon- 

 gitudinally rugose, the former with two central longitudinal cariuEe. Length 

 4i lines. 



Hab. — Massachusetts. Two % specimens. 



C. vil'.icollis. — %. Bhirk, shining; all beneai-h an iennai, anterior orbits, lower 

 half of cheeks, two longitudinal lines on mesothorax, tegulse, line before, spot 

 beneath, seutellum, pleura except large sjiace beneath wings and spot behind 

 antc'ior coxae, four anterior cox£b and trochanters, tips of posterior trochanters, 

 a central apical spot on each dorsal segment, very small on first, and increas- 

 ing in size to the apical segment and the venter, white; antennae longer than, 

 head and thorax, fulvous, brown at base; metathorax truncate behind, rugu- 

 lose, elevated lines tolerably well-defined; wings hyaline, iridescent, nervures 

 black, base of stigma pale, areolet small, oblique, jietiolated : legs honey-yel- 

 low, posi.erior tibias and tarsi black, claws pectinated; abdomen sessile, de- 

 jjressed, first segment rugulose, remainder smooth and shining. Lengtli 4 lines. 



Hah. — -Massachusetts. One % specimen. 



C. clypeatus. — 9 • Black, shining ; clypeus, mandibles and palpi pale yellow; 

 aute'iuBe tawny beneath; tegulce and a dot before, pale yellow; metathorax 

 rounded, shining, with well-deiiued elevated lines; wings hyaline, iridescent, 

 nervures brown, stigma dark brown, jjale at base, areolet small, oblique, sub- 

 petiolated: legs slender, yellowish-ferruginous, the anterior coxae in front, and 

 all the trochanters, lemon-yellow ; posterior coxae, tips of their femora, of their 

 tibiae and most of their tarsi, black or dusky; claws jDectinated; abdomen sub- 

 sessile, shining; apical half of second and the third, fourth and fifth segments, 

 except the sides, rufo-ferruginous, the two following segments with thei.' a'lical 

 margins narrowly yellowish. Lengtii 3 lines. 



ifttS.— Great Slave Lake, British America. (Coll. Mr. E. Norton.) One 9 spe- 

 cimen. 



C. COTiSOrs. — 9. Black, shining; the face, interrupted in the middle with 

 black, clypeus, mandibles, spot beneath eyes, and the palpi, lemon-yellow: an- 

 tennje long, slender, brown above and at base beneath, the rest tawny; tegulse, 

 spot before, seutellum and postscutellum, lemon-yellow; mesothorax smooth 

 and i^olished ; metathorax rounded, shining, with distinct elevated lines ; wings 

 hyaline, iridescent, nervures and stigma brown-black, the latter jiale at base, 

 areolet oblique, subpetiolated ; legs slender, fulvo-ferruginous; the four ante- 

 rior 00X83, aad a.ll the trochanters, lemon-yellow; tips of posterior femora and 

 of their tib'ae dusky; claws pectinated; abdomen subsessile, shining, ferrugi- 

 nous ; first segment, except extreme tip, and lateral margins of all the remaining 

 segments black. Length 3 lines. 



Hah. — Connecticut. (Coll. Mr. Norton.) One 9 specimen. 



Exyston clavatus. — Varies very muoh both in size and color; generally the 

 head above and the thorax is black, but some specimens are moi'eor less varied 

 with ferruginous and some almost entirely of this latter color; sometimes the 

 posterior coxae, and apex of abdomen are black, the latter with the segments 

 always, more or less d'stmctly, margined with yellowish ; the trochanters are 

 genertiUy bright lemon-yellow and the seutellum always more or less yellow. 

 Leogih 2J— 4i lines. Fifteen % 9 specimens from Me., Ct., K". Y., Del., Ills. 



TRANS. AMER. ENT. SOO. (15) JULY, lSt)8. 



