Bept'iJes and 'Amphibians of Illinois. 339 



Carabidii', Formicida', Coleoptera (miscellaneous), Chryso- 

 melida?, Hynienoptera (miscellaneous), Hemiptera (Pentatomi- 

 dae, Lygaiidoe, Aphidida*), Orthoptera, Lepidoptera (larvae), 

 Diptera, Myriapoda, and Arachnida. 



Family HYLID^. 



Parotids generally wanting. Tympanum present. Fingers 

 and toes more or less expanded at their tips; the former with 

 or without webs, the latter always more or less webbed; basal 

 portions of the fourth and fifth toes bound together by the 

 integument. Teeth always on the upper jaw; generally on 

 vomers, and in one genus (Pharyngodon) on the parasphenoid. 

 With or without a fontanel between the parieto-frontals. 

 Omosternum and sternum present; sternum with overlapping 

 cartilages. Transverse processes of sacrum more or less ex- 

 panded. Urostyle attached to two sacral condyles. Vertebra) 

 procceliau. 



The three genera of this family which belong to the fauna 

 of Illinois, agree in lacking parotids, in having maxillary and 

 vomerine teeth, and in having a fontanel between the parieto- 

 frontals. The family is represented in all the zoological regions 

 except the Ethiopian. 



SYNOPSIS OF THE GENERA. REPRESENTED IN ILLINOIS. 



1 (4). Digital discs small; fingers without webs. 



'I (:>). Webs reaching nearly to the tips of the toes. Tympanum 

 not distinct. Transverse processes of sacral vertebra 

 not much expanded AcRis. 



3 {'I). Webs small, not reaching nearly to the tips of the toes. 

 Tympanum distinct. Transverse processes of sacral 

 vertebra widely expanded Chorophilus. 



4(1). Digital discs large; fingers and toes with webs. Tympa- 

 num distinct. Transverse processes of sacral verte- 

 bra widely expanded Hyla. 



