BIOLOGIA CENTRALI-AMERICANA. 
ZOOLOGIA. 
Class INSECTA. 
Order COLEOPTERA. 
Tribe RHYNCHOPHORA. 
Fam, CURCULIONIDA (continued). 
Subfam. CURCULIONIN& (continued). 
Group ZYGOPINA *. 
This is one of the larger groups of the Curculionine, and includes a vast number of 
Tropical-American forms, but few species occurring north of Mexico. The Zygopina 
are, as a rule, easily recognized by their large, exposed, finely facetted eyes, which are 
often so large as to occupy almost the whole of the front of the head. An important | 
work on the American forms by Dr. K. M. Heller, of the Dresden Museum, was 
published in 1895 (Abhandl. Mus. Dresd. no. 11, pp. 1-70, with one plate), and his 
arrangement would have been followed here, were it not more convenient, to avoid 
delay in publication, to deal with the genera seriatim, irrespective of their inter- 
relationship. Cratosomus includes some of the largest, and Psomus some of the 
smallest, of the American Rhynchophora. Most of the species are very active and 
squirrel-like in their movements. Various members of the genera Zygops, Copturus, 
Piazurus, &c. have the habit, as observed by Lacordaire in Cayenne and Brazil, and 
by the present writer in Central America, of resting motionless in the sunshine on 
the trunks of dead or decaying trees. On the least alarm, however, they run rapidly 
round to the other side of the trunk and then drop, only to fly back again before 
reaching the ground to the place from which they were disturbed. 
* By G. C. Cuampron. 
BIOL. CENTR.-AMER., Coleopt. Vol. IV. Pt. 5, April 1906. BB 
