AMERICAN COLEOPTERA. 79 



me to Dr. Schauin, who pronounced it strictly congeneric witli Callir- 

 hipis angulosa Germ., which forms the type of the unpublished genus 

 Plastocerus." Lacordaire and, following him, Duval both call angu- 

 losa the type of the genus, a position which cannot by any means be 

 sustained, as Dr. Leconte did not see that species and probably has not 

 even studied it since that time. 



This would be a matter of very little moment if anguloaa and 

 Scliaumii were really congeneric, of which I have very considerable 

 doubt from the structure of the labrum and the antennae and the form 

 of the mandibles. I have not seen the angulosa and can go no further, 

 and leave the development of the matter to European students. 



Of our own species I have seen and studied many specimens, and 

 conclude that all the forms constitute but one species in which three 

 varieties may be indicated. 



Hind angles of thorax stronglj divergent and earinate. 



Thorax rather narrow not very densely punctured. PI. II, fig. l...Scliaiiiiiii. 



Thorax as broad as long, coarsely and densely punctured. PI. II, fig. 2...1i'siter. 

 Hind angles not divergent feebly earinate. 



Thorax narrow coarsely and densely punctured. PI. II, fig. 3 macer. 



In the accompanying plate I have endeavored to represent the three 

 characteristic forms with the details of sculpture and two additional 

 outlines. There is no constancy in the form of the thorax nor in 

 the sculpture of the elytra all intermediate degrees occurring in both 

 particulars. 



The figure given of frater (PI. IT, fig. 2), is undoubtedly a female, 

 and I find no important difference from the male excepting in the struc- 

 ture of the antennas and the last ventral segment. In the antennae the 

 branches are about half the length of those of the male and not ciliate 

 at the sides, and with a few short ciliae at tip only. The last ventral- 

 segment is merely shorter and broader than in the male. 



If this is really the female, and I think there is no dbubt, the species 

 shows a wide divergence from Euthysanius in this sex, the males of the 

 genera differing merely in the number of the joints of the antennae. 



Occurs in southwestern maritime California. 



In fig. 4, will be found an illustration of a curious monstrosity which 

 explains itself. 



EUTHYSANIUS Lee. 



The form of the labrum appears to have no value specific or otherwise, 



it may be truncate, sinuate or even triangularly emarginate and in the 



same species. There appear to be but two species in both of which 



I observe an amount of variation which, with fewer specimens, would 



