OBSERVATIONS UPON THE HETEROPTEROUS HEM- 

 IPTERA OF LOWER CALIFORNIA, WITH DE- 

 SCRIPTIONS OF NEW SPECIES. 



BY P. R. UHLER. 



A collection of Hemiptera from Lower California has 

 been placed at my disposal for study by Dr. H. W. Hark- 

 ness, President California Academy of Sciences, where 

 the types now are. Through the zealous interest of Dr. 

 Gustav Eisen, who made the largest part of this collection, 

 under the auspices of the California Academ}^ of Sciences, 

 our knowledge of the fauna of Lower California has 

 been greatly extended and increased. Hitherto, the col- 

 lections made by Mr. John Xanthus de Vesey, Baron 

 von Osten Sacken and Henry Edwards, have been almost 

 the only sources of reference for information relative to 

 the Hemiptera of that country. The assemblage of 

 forms now known from the region near Cape St. Lucas 

 numbers somewhat over one hundred species. Doubt- 

 less many more species will yet be secured when sufficient 

 time can be devoted to close collecting. From the entire 

 peninsula, including a few of the islands along the coast, 

 as well as some of those in the Gulf of California, about 

 three hundred species have thus far been collected. 

 Taken as a whole, the assemblage of species is Mexican, 

 and it forms a part of that which extends into Arizona, 

 to which the name Sonoran has been applied, A ver}- 

 small percentage, embracing such forms as Pachycor/s 

 torridus Scop., Pachylis gig'cis Burm,, and Sphictyrttis 

 bugahensis Dist., which form no necessar}^ part of the 

 Sonoran, but which belong to an overflow of the tropical, 

 has been made possible by the long stretch of coast, the 

 sufficiently prolonged high temperature, and the not dis- 

 tant lands from which tropical forms could be readil}' 

 transported. Accordingly, the writer does not regard 



2d See., Vol. IV. June 20, IsOi. 



