BY THOMAS G. SLOAXE. 341 



chitinous strip. (The double form is more recent than the 

 single form). 



Single fortn of closed cavity. — Intercoxal declivity present 

 behind coxa^, its sides more or less prominent, and meeting epi- 

 meron to enclose the cavity ; chitinous partition completely 

 separating cox?e, thin in middle, explanate on upper side, and 

 forming a wide support for the peduncle of the body, which may 

 be called the intercoxal jjlate; anterior extremity of intercoxal 

 plate more or less transverse, often with two, narrow, chitinous 

 processes projecting forward (the apical parts of the intercoxal 

 plate help to support the muscles of the legs, and are found 

 throughout the whole of the Carabida?). 



Double form of closed cavity. — Intercoxal parts of prosternum 

 formed generally as in the closed, single form, but with the 

 chitinous, transverse, apical piece of the intercoxal plate produced 

 on each side to meet the epimeron, and dividing the inner opening 

 of the cavity into two, viz., an anterior opening, through which 

 the muscles and nerves of the leg pass into the prothorax, and a 

 posterior opening between the intercoxal plate and the epimeron, 

 the posterior opening apparently having no functional utility. 

 The double form of closed, anterior, coxal cavities occurs through- 

 out the family Cicindelidie, as well as in the Tribes Lebiini, 

 Helluonini, Brachynini, and others of the Carabida?. 



(6). Pseudomorphid form. — Anterior coxal cavities with a 

 single opening inwards, intercoxal declivity present, projecting 

 backwards and supporting peduncle of body; chitinous partition 

 completely separating coxte, intercoxal plate very short; epimei'a 

 uniting with apex of intercoxal plate to close the cavities behind. 

 This form occurs only in the subfamily PseudomorphinHB. 



(c). Omophronform. — Anterior coxal cavities closed behind by 

 the union of the epimera with a narrow, erect process extending 

 from each side of the apex of the point of the prosternum; inner 

 opening single; peduncle of body supported by the point of the 

 prosternum; no intercoxal declivity or intercoxal plate present; 

 intercoxal partition reduced, inner side almost vertical, narrow 

 anteriorly, dividing into two ridges at middle, these ridges 



