1914.] NATURAL SCIENCES OF PHILADELPHIA. 71 



Material. — In the preparation of the present paper the types of 

 the following species have been before us: 



(Dichopetala pulchra Rehn, synonym of D. mexicana Brunner.) 



Dichopetala falcata n. sp. 



Dichopetala serrifera n. sp. 



Dichopetala durangensis n. sp. 



Dichopetala pollicifera n. sp. 



Dichopetala tauriformis n. sp. 



Dichopetala castanea n. sp. 



Dichopetala hrevihastata Morse. 



{Dichopetala Icevis Rehn, synonym of D. hrevihastata Morse.) 



Dichopetala gladiator n. sp. 



Dichopetala orececa n. sp. 



Dichopetala catinata n. sp. 



Dichopetala tridactyla n. sp. 



Dichopetala caudelli n. sp. 



The entire series of the genus examined by us numbers 362 speci- 

 mens. The great majority of these (239) were taken by the authors 

 on recent trips and are located in the Hebard Collection and that 

 of The Academy of Natural Sciences of Philadelphia. Of the 

 remainder of the representation we have had before us, 37 specimens 

 were from the Hebard Collection ex Brunner; 27, comprising the 

 entire series of the genus in the United States National Museum, 

 were examined through the kindness of Mr. A. N. Caudell; 50, 

 forming the entire series in the Scudder Collection, were either 

 loaned or made accessible to us by Dr. Samuel Henshaw, of the 

 INIuseum of Comparative Zoology, and a few specimens each were 

 loaned by the authorities of the Field Museum and the American 

 jNIuseum of Natural History. To the above-mentioned gentlemen 

 and the authorities of these museums we wish to express our hearty 

 thanks for their assistance in the work. We have, with their co- 

 operation, been able to examine almost all of the material in America 

 on which the records of the genus were based. Aside from the 

 typical material of the two original species of the genus, no recorded 

 specimens of the group exist in other collections. 



Key to the Species. 



Males. 



A. — Cercus subfalciform, non-furcate. 

 B. — Cercus non-serrate. 



C— Length of pronotum equal to one-third that of cephalic 



femur. Subgenital plate produced into lobes 



mexicana Brunner. 



