Slee CALIFORNIA ACADEMY OF SCIENCES [Proc. 47H SER. 
Dr. R. W. Doane of Leland Stanford Jr. University has also 
rendered invaluable assistance by sending for examination the 
most important of the material collected by the Hopkins-Stan- 
ford Expedition to the Galapagos. From this material we have 
been able to select single types for the species described by 
McNeill, determine their validity, and ascertain their proper 
generic position. 
As this was the tenth scientific expedition to visit these 
islands, we believe that the Dermaptera and Orthoptera there 
found are now very well understood. As is usual in insular 
environment, the number of native species known to occur in 
the Galapagos is very small in comparison with any continental 
locality situated on the Equator. One roach, one mantid, eight 
grasshoppers, four katydids and four crickets comprise the 
native species. These are, however, of decided interest, as all 
but one grasshopper, one katydid, and one cricket, are peculiar 
to this archipelago. Additional interest is found in the fact 
that the grasshoppers, Schistocerca hierosa (Walker) and 
Halmenus robustus Scudder, each divides into three distinct 
geographic races, while the color forms of Schistocerca melano- 
cera (Stal) are remarkably intricate, and Schistocerca mter- 
media Snodgrass, is found to be a striking type, evidently an- 
nectent between the two other very different appearing species 
of the genus. One earwig and eight roaches are adventive. 
It has long been known that many forms of life found on the 
Galapagos exhibit a complexity seldom found under natural 
conditions. Thus in the birds, the genus Melanospiza has 
proved a most difficult and intricate problem. In the Orthop- 
tera we find that we are confronted with racial differentiation 
only in the two species of grasshoppers noted above. 
It is evident that the complexities known to occur in the biota 
of the Galapagos have led several authors into assuming that 
far more racial differentiation existed in the Orthoptera than is 
really the case. We can find no justification for Snodgrass’s 
division of Sphingonotus into two species and many races, or 
of Schistocerca melanocera into numerous races. McNeill is 
similarly at fault in endeavoring to divide his material of the 
genus Liparoscelis into three species. 
The present known distribution of Orthoptera in the Gala- 
pagos Archipelago is shown by the following table. 
lier A Mil 
