JAMES A. (i. KEEN 
187 
tor ill hand, the association may be found unwarranbal and the 
removal of one of the forms {crotalum) to the Sliaslanns ({ronp 
neccssilated. The spi'eies coconi no very nearly approaches C. 
rahula altior, in fact in some respects seems almost a replica of 
it, with certain differences discussed below, and through these 
t\vo entities it Mould seem that the common ancestry of tlu'se 
jirouiis (i. e. the Rabiila Group and the Crotalum Group; is evi- 
dent. (droups M'e are calling these, as they can readily lie dis- 
tinguished by the yelloM' to brownish caudal tibiae of the Ka- 
bnla assemblage, and the deep glaucous blue of the one here 
treated; also we have no evidence that rahula and coconi no 
intergrade, although such may be the case. The true position 
of crotalum, as intimatiMl aliove, may lx* found eventually to be 
in the Shastanus Group, the forms of M'hich at present so placed 
have pah'i- glaucous caudal tibiae. However, at this Mriting 
tlu' association of coconi no and crotalum simmus best, particu- 
larly as .'<h(i,sta ti us has a much more comiilex secondary venation 
of th(‘ wings, a single a.xillaiy vein in tlu' same and a more com- 
pressed general toiin. from splendidus, another numiber of 
the Shastanus Group, the slender geiu'ral form will at once 
s(‘parate crotalum. 
Circotettix coconino new speeie.s (Plate Xlt, P) (o 21.) 
A stocky robust form, with relatively short and broad t('g- 
niina and but little distal prolongation of tlu' wings, the distal 
margin of the axillary field of the same M'ell ai'cuate. Looking 
much like a deep glaucous Idue tibiaed C. rahula altior, it, hou'- 
cver, can l)e separated by the greater M’idth pi-oximad of the 
area of the median forks of the Ming, Mhich n'gion is, by virtue 
of the shorter Mungs, much shorter and Math IcM'er cross-veins. 
The eye, in basal outline, is also more elliptical and not sub-ovoid. 
The diiferences from G. crotaluun are given under that s])pcies. 
Type. — cf ; Bill Williams Mountain, Coconino C'ounty, Ari- 
zona. September 14, 11)17. ((). C. Poling.) [llebard Collec- 
tion, Type no. 767.] 
Size medium; form robust (for the genus). 
Head relativ'ely narrow, greate.st width across genae contained slightly 
less than one and one-half times in greatest depth of same; in prohlo with 
occiput and fastigial outline markedly bullato-arcuate, fastigi(j-facial angle 
narrowly ujimded obtuse, faintly projecting: fastigium moderately broiid. 
■niANS. .\.M. ENT. sue., XLVII. 
