252 CALIFORNIA ACADEMY OF SCIENCES. 



surely distinct from the eastern species, and the above 

 name is therefore proposed for it. 



The chief differences noted are as follows: 



Elasmocerus terminatus. Elasmocerus californicus. 



Antennae 10-jointed, the last joint Antennae? 8- jointed (male), 9- 



in the female fully as long as the jointed (female); the last joint in 



preceding joints combined. the female scarcely as long as the 



preceding joints combined. 



Punctuation, especially of the Punctuation comparatively fine, 

 elytra, closer and much coarser. 



Prothorax yellow, with a larger Prothorax black. 

 or smaller discal spot. 



Elytra with lateral margin pale in Elytra with a transverse median 



front, the transverse median pale pale spot which usually reaches 



spot feeble, or with only a slight nearly to the suture, but is rarely 



inward prolongation of the yellow marginal; the margin of the elytra 



margin. not pale in front of the spot. 



Abdomen entirely yellow in the Abdomen more or less yellow 



male, the sixth segment black in along the middle, the sides black in 



the female. both sexes. 



Legs black. Legs bicolored. 



In the male the three or four antennal joints follow- 

 ing the second are so short and closely connate that 

 they are difficult to count. In the single male of E. 

 californicus here described the number of joints is surely 

 eight, but other examples will, perhaps, show the num- 

 ber to be nine, as in the female. Specimens from both 

 middle and Southern California have been seen by the 

 writer. 



Hemiptychus. 



The species of this genus are moderately numerous 

 in the United States, but they offer so little in the way 

 of differential characters that their identification is a 

 matter of much difficulty. The following species seem 

 in one or two respects so different from any known to 

 us that the very brief diagnoses here given should be 

 sufficient for their recognition. 



