TIIK BATliACIIIA OF NOlMll AMERICA. 321 



abilominal iiitejcumeiit as an adhesive siipitort, as this faculty L uo- 

 wiieie better seen than in the Aeri.s, where «leini is free. This creat- 

 ure will adhere for days to a vertical j;lass [tlatc, not only by the alido- 

 nion and digits, but by (he interdigital membranes, and will light se- 

 curely frqni a long leap on such a surface. Daudin and Dumeril have 

 relaled the siime adhesive faculty in J'clodyte.s puiutatiis, \\\\Wi\i in not 

 knovvn in regard to the dermal attachments, but has not the abdominal 

 areoia; present in Acris. Tiie extent of the attachment is least where 

 the dilatations arc snndlest, as follows: 



Abdoini-ii ciitii'cl.v attadird ; 1h h\). 



riiyllDiiicdiisa four sp. A^,'.ilyclinis three si>. Trachyoopliahis two Hp. Noto- 

 t reitia (Mie sp, Scytiipis t wo sp. Siiiilisi'a liaiidiiiii. 



Hypsilioas all)oiiiai-;j;iiiala, lioans. IFyla a;;rt!slis, kre'll'lii, iiliyllouliroa. 

 Posterior lialf or tliird of abiloMieii attached; laterovciitral liaiid wide. 



Triprioii pelasatns. 



f[yhi fiise.i, areiiieolor, <;ratiofiii, ver.sieolor, feinoralis, f-(inirena, aiidersoiiii, C(u- 

 ridea. 



Kaiioiih'a aiirea. 



Clioroi>hihis lii.seiiatiis. 

 Less than posteiioi' thinl ahdoineii aKaelied; tlio hiteroveiitrals wide. 



Ilyhi ailicirea, rcniUa, lateralis, miotyiiipaiiiiin, piekeriiigii. 



Chorophiiiis nij^ritiis. 

 AlHloiiieii entirely free. 



Hyha leseiirei, eiirla, j;raeilipes. Aeri.s j;ryllus. 



Of distinguishing features, whicli aie seen in tli<^ degree of develop- 

 njeut of the elements of the skull, there are, lirst, the devei()i)ment of 

 the o. o. frontoparietalia ; secontl, of the prefrontalia ; third, of the sii- 

 perlicial cranial rugositi«'s; fourth, of vomerine teeth; tilth, of a post- 

 frontal arch; sixth, of the ethmoid iirch. 



Wludc iiuiiilier ol' species li*3 



l'''roiitoparietals fully de velojied \>-i 



l-'roiitoparietals with rii<.osities peiietratini; ileriii '.» 



I'rofroutals developed 17 



No vomerine tecih G 



A postfroiital proees-i I 



Ethmoid incomplete ali<ive 1 



Of the al»ove lOiaracti'rs the lack of vomerine teeth is incimstant in 

 rhyllomiiilusa, being present in soiiir anil wanting in otlier si)i'cies. 



There is a ♦I'lidency to tiie I'sciidis and Ifaiia lilteration of the outer 

 metatarsus in /////(( nmvrivmm. hjipostivtn, and (limolop.s, ami //. r UanoUka) 

 auri((. 



I'iirotoiil glands otu'ur in some species of ll.\ lida; as an extensive stra 

 tuiu of crypts, but lU'ver exhibit tiie delinition seen in liulbiiil'orm tuid 

 .some C'ystigiia; 'lid genera. It even occurs in tSci/hipifi rcnidoNHis irreg- 

 ularly, being s(Uiietimes present and sometimes wanting in the female, 

 at least. 



The xiphistornum exhil)its the Ibrm whicii I'xists in the greater num- 

 ber of ('ystignathi(he, excepting ill eight species, where it only lacks 

 the posterior emargination. 

 l!»Ol_l]ull '61 L'l 



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