398 REi'Oirr of state geologist. 



the color and the relative nieasnrements of the different organs. As 

 the two sexes are colored alike and are usuall}^ found in close prox- 

 imity there will be little difficulty in placing the female after deter- 

 mining the male by the key given below, which mainly pertains to 

 that sex alone. 



Seven species have, up to the present, been taken by the writer in 

 Indiana. 



KKY TO IM)IAXA SPECIES OF CEUTIIOrUILUS. 



a. Fore foinora but little, if any, longer than the pronotuui. 



h. Hind til)ia' of male arcuate or sinuate in l)asal half; the hind 

 femora of male Avitli aliout 13 small, unequal spines on the 



outer lower carina 11.3 maculatus, p. 399 



6ft. Hind tibipe of male straiglit; hind femora of adult male with 

 8 to 11 rather large, unequal spines on the lower outer carina; 

 a broad, darlv brown or blaclvish stripe on either side of dor- 

 sal surface of body 114 Intem, p. 400 



aa. Fore femora one-third or more longer than the pronotum. 



c. Hind femora distinctly shorter tlian the corresponding tiltiii?; 



cave inhabiting species 11.5 ntyo'ius, p. 401 



cc. Hind femora but little, if any, shorter than the corresponding 

 tibiae; species living above ground. 



d. Lower outer carina of hind femora of male conspicuously 

 spined. 



e. Inferior sulcus of hind femora of male quite deep 



and of miiform width; the outer carina with seven 

 to nine spines of unequal length and not equi- 

 distant 110 hlatcMn)i, p. 403 



ee. Inferior sulcus of hind femora of male shallow and 

 broad; wider at base than at distal end: the spines 

 of the outer, lower carina sub-equal in size and 



e(iui-distant 117 i(hleri. p. 404 



(hi. Lower outer carina of liind femora of male never con- 

 spicuously spined. 



f. General color clear reddish ))ro\vn. mottled with 



paler; hind femora of male more than twice as 

 long as the fore femora; each of the lower carinte 



with about 25 crowded minute teeth 



lis tcrrrstri.^, p. 4(M) 

 ff. General color dull sooty brown witli numerous paler 

 spots; hind femora of male about twice as long as 

 the fore femora, with seven to 1.5 small but dis- 

 tinct teeth on eacli of flio carina' 



119 bnripcf). p. 40G 



