OF NATURAL HISTORY. 710 



somewhat fuliginous : pleura with an oblique, yellow line over 

 the posterior feet : tergum, first segment with a dull ferruginous- 

 yellow band at base and a subterminal yellow one; on the middle 

 of the tergum on each side a transverse yellow spot ; a yellow band 

 on the posterior submargin of the penultimate segment; and a 

 double [270] yellow spot at tip of the ultimate segment : oviduct 

 longer than the abdomen, reaching almost to the scutel : tarsi 

 and anterior tibias ferruginous, the latter dusky on the middle : 

 intermediate tibiae and knees yellow, tinted with ferruginous be- 

 hind : posterior thighs dentated beneath, yellow at base and tip ; 

 tibias yellow before, somewhat ferruginous behind. 

 Length seven-twentieths of an inch. 



% Tergum on each side anterior to the middle, a slightly 

 carinated line ; lateral yellow spot on the middle none ; a yellow 

 band on the middle or a little posterior to the middle, and to- 

 wards the tip another yellow band ; on the posterior declivity is 

 an abbreviated longitudinal yellow line or spot; sides with a yel- 

 low spot or line interrupted from the extremities of the two pos- 

 terior bands ; of the two spots the anterior one is sometimes 

 Avanting, and in some specimens is a lateral yellow joint near 

 the tip. 



Length three-tenths of an inch. 



Closely resembles offinis nob., in color and markings, but be- 

 sides other differences the present species is larger and more 

 robust, and the oviduct is longer than the abdomen. A female 

 specimen was sent me by Dr. Harris, and I obtained several 

 males and one female in this State. Dr. Harris's specimen 

 varies in having only a rudiment of the yellow spot of the mid- 

 dle of the tergum. 



I have obtained them chiefly on the blossoms of the parsnip. 



CHALCIS Fabr. Latr. 

 1. C. AM(EN A.— Yellow, variegated with black. 

 Inhabits Indiana. ^^^^^ 



Body with large, close-set punctures : yellow, slightly tinged 

 with green ; occiput and antennae, excepting the basal joint be- 

 neath, black : thorax quadrilinear with black, the intermediate 

 lines confluent at the middle, and all united by a transverse hue 

 1835.] 



