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there is a projection of the anterior part of the orbit over the 

 eye in Colymbetes and not in Dytiscus. This character has not 

 been noticed by entomologists. You will see it very distinctly 

 in the beautifnl and rare C. sculptilis. 



Have you a Scymnus ? I have raised a single specimen of 

 three species. The genus was separated from Coccinella by 

 Herbst. The " thorax is scarcely narrower than the coleoptra, 

 the lateral and external margins meeting together ; body ovate, 

 pubescent," three last joints of the antennae (nearly connate) 

 united closely in an ovate club. The species are small, and the 

 larvae, I believe, have not been described. Like those of the 

 Coccinella they feed upon Aphides. They have on each seg- 

 ment six flocculi, in a transverse series, white as snow, and of a 

 cottony appearance. They wander among the aphides, seize them 

 with their mandibles, then elevate them, and suck their juices 

 out, leaving only the skins. They become pupae on the leaf of 

 a plant, as do the Coccinellce. Scymnus, as you know, means 

 lion's whelp. My first discovered species I named $. ferox, a 

 character which it seems is not peculiar to one species of these 

 " wolves," or lions, "in sheep's clothing." 



The larva of Hispa is an anomaly in its habits. It feeds 

 upon the parenchyma of leaves between the cuticles, and its 

 situation is detected by a yellow or reddish spot. You will not 

 confound it with the subcutaneous Tinece whose habits are 

 similar. The larva of Hi spa is a hexapod, that of the Tinece 

 apod. The larva of Clythra dominicana lives in a case ; I ob- 

 tained some of the pupae-cases under a stone ; they are very 

 curious. Perhaps you may find those of your large Southern 

 species. The larva of Imatidium argus Herbst, is much like 

 that of Cassida, but the spines are branched. How this genus 

 and Hupa can have any affinity I cannot conceive, so adverse 

 are the larvae and their habits. 



