HEMIPTERA OF LOWER CALIFORNIA. 267 



Thyrillus pacificus Uhler. The specimens in this 

 collection are labeled " Cal. 9." A few broken speci- 

 mens from Lower California were given to me by Mr. 

 Henry Edwards. This species seems to be fairly com- 

 mon at Los Angeles, San Bernardino and in the neigh- 

 borhood of San Francisco. I have also seen a few speci- 

 mens from southern Nevada, and others from Yakima, 

 Washington. 



Thyrillus brachycerus Uhler. This is also a com- 

 mon insect in various parts of California. One speci- 

 men is in the bottle labeled San Jose del Cabo, and it 

 was collected by Dr. Gustav Eisen. Other specimens 

 in the collection are labeled "Cal. 9." Both of these 

 species were placed in the genus Rhopalotomus when 

 first described, but they seem to constitute a new genus, 

 for which the above name is proposed. 



Pycnoderes quadrimaculatus Guerin. This is a 

 common insect which inhabits sandy localities on both 

 sides of the North American continent south of the lat- 

 itude of New Hampshire on the east, and probabl}^ of 

 San Francisco on the west. It occurs, also, in Cuba 

 and other islands of the West Indies. A single specimen 

 was taken near Cape St. Lucas by Mr. John Xanthus. 



Cyrtocapsus caligineus Stal. One specimen was 

 taken near Cape St. Lucas by Mr. John Xanthus. The 

 species is widely distributed in California, and it appears 

 to be moderately common in the vicinity of San Fran- 

 cisco. 



Malacocoris irroratus Say. A soiled and damaged 

 specimen (No. 755) of this common insect is in the col- 

 lection which was made at Calmalli mines, in April, by 

 Mr. Charles D. Haines. 



