1847.] Description of JVew and Interesting Animals. 193 



should have been represented herai-hexagonah In that species 

 at least twenty-five articulations project beyond the incisure; the 

 carina is reddish, and the whole color darker than in A. affinis. 



Until recently this was exclusively a European genus. A. lon- 

 gicaudatus is found on the eastern side of the Ro.cky Mountains, 

 and that now described, inhabits the still more distant region of 

 the Sandwich Islands, whence it was brought by ray friend J. C. 

 Reinhardt, M. D., Naturalist of the United States Ship Coustitu- 

 tion. It is from the interior of one of the islands. 



Cecidomyia robinle. 



3. Wing-. 4. Head and Mouth. 



Auranliaca, aloe pallide obscurae; thorax m&culis 3 longilndinalibus obscu- 

 ris, pleura macula obscura: abdomen segmentis 1- 2 obscuris. Long 1| lin. 



Pale orange; eyes black, reticulate; antennae, front, wings, a 

 large macula upon the pleura below the wing, and another be- 

 tween the anterior and medial feet, dusky; antennse (?) 14-arti- 

 culate, verticillate, slender, articulations separated, scapus rather 

 thick, and with the pedicellum translucent; t about 24-articulate, 

 slender; palpi slender cylindric, 3-articulate, terminal articulation 

 more slender and longer than the preceding ones: thorax w'th 

 three large oval conspicuous dusky vitta: abdomen 9-articulate, 

 two basal articulations dusky above. 



This insect in the larva state, feeds upon the leaves of the Ro- 

 binia pseudacacia, the margin of which it forms into a roll. The 

 larva is white, or pale orange, of 13 segments, the first of which 

 receives the retractite head; nine segments, from the fourth to the 

 twelfth inclusive, with spiracles. The pupa does not form a co- 

 coon, but lies without a covering. It can move itself by means 

 of the abdomen. 



No. 18 



13 



