GALERUCINE BEETLES — BLAKE 235 



of the usual appendiculate ones. One species of the first group so 

 closely resembles a species of Trichobrotica in general appearance that 

 it would appear to be only a color form. The other species has been 

 described iirst by Weise as PhyJlobrotica subtilis, and later by Bechyne 

 as Neobrotica achroma, but it belongs to neither genus with its bifid 

 claws. For these species I have erected the genus Neotrichota. 



The second group with bifid claws is most remarkable for its bi- 

 zarrely formed antenna! joints in the male. No female of any of the 

 three species has been examined. All three bear a close resemblance to 

 each other in elytral markings as well as in having the antennal joints 

 similar though distinctly different in each. The only specimens 

 of Diabrotica pectinicornis Baly I have ever seen, which I have taken 

 as the type of this genus, are one collected at Cauca, Colombia, in the 

 British Museum, and one collected in "Bolivia," in the Bowditch 

 collection. The second species, which is new, was taken at Tingo 

 Maria, Peru, and the third, also new, at Turrialba, Costa Rica. 



John "Wilcox has discovered in the U.S. National Museum collection 

 a second species of that odd genus Oroetes, originally described from 

 Panama. The second species was taken in Bolivia. It has a similar 

 but smaller modification of the third and fourth antennal joints in the 

 male, and as in 0. flavicollis there are only ten antennal joints in the 

 male, and the excavation of the face is similar. 



I wish to acknowledge my indebtedness to the U.S. National 

 Museum (USNM), the Museum of Comparative Zoology (MCZ), and 

 the British Museum (Natural History) (BMNH), for the material on 

 which this study is based. Mr. Hugh Leech also has picked out ma- 

 terial for me to study at the California Academy of Sciences (CAS), 

 and for some years John A. Wilcox has been assiduously finding 

 specimens for me in the collections with which he has worked. I have 

 visited the Frey Museum at Tutzing near Munich to study Bechyne's 

 types and also the British Museum (Natural History) on a grant from 

 the National Science Foundation. A later grant from the National 

 Science Foundation has enabled me to examine insect collections in 

 Brazil, Argentina, Peru, and Colombia. 



Key to the Genera of Galerucinae Here Treated 



1. Claws bifid 2 



Claws appendiculate 3 



2. Antennae in male bizarrely shaped with greatly enlarged 9th and 10th 



antennal joints Deinocladus, new genus 



Antennae in male no different from female .... Neotrichota, new genus 



3. In male, the face excavated, 3rd and 4th antennal joints with excision at ad- 



joining ends, a node anteriorly in the middle of pronotum . . Oroetes 

 Face and antennae in male not excavated, no median node 4 



