r»R 1 HE ABVATs^CEMEHT OF SCIENCE. 



PSYCHE. 



ORGAN OF THE CAMBRIDGE ENTOMOLOGICAL CLUB 



EDITED BY GEORGE DIMMOCK AND B. PICKMAN MANN. 



Vol. II.] Cambridge, Mass., May-June, 1879. [No. 61-62. 

 The Anatomy of Amblychila cylindriformls Say. 



(TFiV/i lithographic plate i.) 

 LITERATURE. 



Imigo. Schaupp: On the Cicindelidae of the United States (BulL 

 Brooklyn Entoni. Soc, June 1878, v. l,no. 2, p. 5). 



Lnrva. Horn: Descriptions of the larvae of the North American genera 

 of Cicindelidae, . . . (Trans. Amer. Entom. Soc, 1878, v. 7, p. 28-40, 

 pl-2.) 



See also Brous: Habits of Amblychila cylindriformis (Trans. Kansas 

 Acad. Sci., 1877, v. 5, p. 11-12), and Snow: Amblychila cylindriformis 

 Say (Trans. Kans. Acad. Sci., 1878, v. 6, p. 29-32). 



I began the investigations recorded in the present paper in 

 the winter of 1877-8, on the receipt of fifty specimens of A. 

 cylindriformis from Mr. George Porter Cooper, of Topeka, 

 Kansas, but dropped the subject in the spring, and only took it 

 up again in January 1879, on the receipt of fresh material 

 from Prof. F. H. Snow, of the State University, Lawrence, 

 Kansas. I had occasion also to dissect numerous specimens of 

 Omus audouinii, received from northern California and from 

 Prof. O. B. Johnson, Salem University, Oregon. 



In comparing the two genera, I find that they differ in several 

 points. Omus has the facets of the cornea of the eye convex,^ 

 while in Amblychila the eye is entirely smooth. The accessory 



^ Omus and many other Cicindelidae have not only very convex facets on the 

 cornea but also comparatively large eyes, both these characters giving more distant 

 sight than Amblychila has. The cones ai-e biconvex in Omus, while in Amblychila 

 they are only convex interiorly. The more anterior position of the eye in many 

 Cicindelidae gives better sight than a lateral position would give; in the latter case 

 the antennae are of far more use, as organs of touch, than in the former. 



