340 ENDOSKELETON OF MEAD, ifec, IX CARABID^, &C., 



great work. It is only as a character helping to differentiate the 



Carabida; from the Cicindelidai that reference is here made to it. 



ii. Anterior Coxce. 



It is not proposed to go carefully into the anatomy of the 

 anterior coxae, with their marked difference of inset in the coxal 

 cavities, between the Carabidtie and Cicindelidse. The following 

 are the main differences between these families. 



Carabidce. — Axis of anterior coxa obliquely longitudinal, points 

 of articulation with coxal cavity at ends of joint, both these 

 points hidden ; posterior articulation-point prominent, placed 

 beside and behind the socket to receive the trochanter. 



Cicindelidce. — Axis of anterior coxa transverse, points of 

 articulation opposite one another ; external articulation-point 

 small, visible, placed above, anterior to, and distant from, the 

 socket to receive the trochanter. 



iii. Anterior Coxal Cavities.. 



The coxal cavities of the Cicindelidse have been fully treated 

 by Dr. Walther Horn;"^ therefore, only those of the Carabidce 

 are here dealt with. 



There are two distinctive and well known forms of the anterior 

 coxal cavities of this family: (1) closed cavities, where the inter- 

 coxal part of the prosternum and the epimera meet behind, and 

 completely enclose the coxal cavities; (2) open cavities, where 

 the intercoxal part of the prosternum and the epimera do not 

 meet posteriorly, but leave the coxal cavities open behind. 



(1) Three forms of the closed cavities are known to me, viz., («) 

 the Scar it id-form (typified in the genus Scarites), (h) the Pseudo- 

 niorphid-fvrnt (typified in the genus Silphoiriorpha), (c) the Ojho- 

 2)hrou-forin (occurring only in the genus Omophron). 



(a). Scaritid form. — At least two modifications of this type of 

 the anterior coxal cavities are to be met with — the single form., 

 in which the opening of the cavity inwards is single (this is the 

 usual form in the Carabida;), and the doable form, in which the 

 inward opening of the cavity is divided by a narrow, transverse, 



* Cf. Dr. Walther Horn, in Wytsman's Genera Insectorum. Col. Ade- 

 phaga, Subfain. Cicindelidte. Fasc. 82A, pp. 19-22, Taf.4, figs. 28-48. 



