NATURAL SCIENCES OF PHILADELPHIA. 525 



b. Hind angles of thorax moderately prominent : 



34 -37. Antennae, tip of tibia?, tarsi and trunk dark brown ; thorax 

 scarcely punctulate ; elytra scarcely costate. Kansas, stygicornis Say. 



c. Hind angles of thorax very slightly prominent : 



27 *35. Etytra scarcely costate ; antenna? and abdomen not infuscated. 

 Middle and Western States, Kansas. cordicollis$ Lee. . rejectus Lee. 



F. Smaller species ; thorax longer than wide, convex, constricted behind, 

 hind angles prominent ; elytra, humeri distinct. 



a. Epipleuree as usual of the color of the elytra : 



29. Elytra oblong, scarcely dilated behind ; abdomen not infuscated. Mid- 

 dle States. Aptinus janth. Dej. . . . janthinipennis Lee. 



36. Elytra broader quadrate, dilated behind, slightly costate ; trunk infus- 

 cated. Southern and Western States. . quadripennis Dej. 



18 *25. Elytra dilated behind, not costate ; abdomen dark brown. 



medius Lee. 



b. Epipleura? pale testaceous ; 



33 -39. Thorax less narrowed behind than usual ; sides of metathorax 

 and abdomen, and knees dark. Southern States and Arizona, as far as Colo- 

 rado River lateralis Dej. 



ft. Small species ; thorax longer than wide, hind angles not prominent ; elytra 



wider behind, humeri indistinct. 



28 *36. Thorax very broadly rounded on the sides in front ; sides of abdo- 

 men dark. Middle and Southern States, cejihalotest Lee. 



o v i p e n n i s Lee. 

 a. Thorax more strongly rounded on the sides in front : 



30 "SO. Abdomen dark brown. Middle, Southern and Western States. 

 patruelis Lee. . . . . . . . . conformis Dej. 



21. Abdomen not infuscated. Middle States. . . pumilio Lee. 



Contributions to Organic Morphology : Containing the mathematical imita- 

 tion of the egg of PLANORBIS CORNEUS and of EPIORNIS ; and upon the 

 resemblances between Mathematical, Acoustic, Electric, Optical and Organic 

 Figures ; with historical and other remarks. 



BY JOHN WARNER, A. M. 



PREFACE. 



In a work published several years ago, I endeavored to make some contri- 

 bution to the knowledge of Organic Morphology.* Among other matter, the work 

 contained the results of investigations made to determine the coincidence in 

 form between sections of hen's eggs and a curve there proposed. In the pres- 

 ent paper, it is designed to extend these investigations, and to notice some 

 other subjects of interest. Some use will be made both of original and selected 

 matter contained in the work referred to, and other citations will be added, 

 which seem appropriate in treating a branch of science not yet possessing a 

 classified and independent literature. 



MORPHOLOGICAL LITERATURE. 



Numerous authorities might be cited, bearing upon the general subject of 

 our research, and containing information and suggestions worthy of study; 



* Studies in Organic Morphology, by John Warner. J. H. Lippiucott & Co., Philadelphia, 1857. 



18G2.] 



