288 CALIFORNIA ACADEMY OF SCIENCES. 



LIMNOBATID.^. 



LiMNOBATES LiNEATA Say. One specimen of this 

 form was brought from Cape St. Lucas by Mr. John 

 Xanthus. 



HYDROBATID^. 



Hygrotrechus robustus Uhler. Specimens of this 

 species were captured at San Jose del Cabo by Dr. Gus- 

 tavEisen; others were taken at El Paraiso, Comondu 

 and San Jorge, in March, by Mr. C. D. Haines. A few 

 others in the collection were taken at other localities in 

 California. Numerous specimens were secured near 

 Cape St. Lucas by Mr. John Xanthus. 



Hygrotrechus n. sp.? 



A single damaged specimen was in the set from Cape 

 St. Lucas. It appeared to be near H. rcmigis Say, but 

 its identity could not be established from such meagre 

 material. 



LiMNOTRECHUs MARGiNATUS Say. Specimens of this 

 species were taken near Cape St. Lucas by Mr. John 

 Xanthus. It is found also near San Diego, Los Angeles 

 and at other localities in southern California. 



Halobates wuellerstorfii Frauenf. Specimens of 

 this marine insect were secured near Cape St. Lucas by 

 Mr. John Xanthus. 



VELIID^E. 



Hebrus sobrinus Uhler. One specimen was brought 

 from near Cape St. Lucas by Mr. John Xanthus. It 

 seems to be distributed over most parts of southern Cal- 

 ifornia and Arizona. 



MiCROVELIA signata n. sp. 



This species has somewhat the form of JM . inodesta 

 Uhler, but it is a longer and much more conspicuous in- 



