36 PROCEEDINGS OF THE NATIONAL MUSBRUM VOL. 92 
The eggs of S. dorothae are about the same size as those of S. texanus, 
but the wrinkled envelope seems to be much thicker and more coarsely 
folded. I am not sure how constant this character is. 
The caudal furcae of the male are heavily setiferous to the end, con- 
trasting with the spiny distal half in S. sea/i but not differing apprecia- 
bly from the male fureae of S. texanus. 
NEBR. pee 
o- 
COLO. 
NEW MEXICO 
+o, 
+0 
TEXAS 
Hf ¥ 
XZ 
oF 
o- wr ol 
Ficure 6.—Distribution of Streptocephalus texanus and S. dorothae. Records of S. texanus 
given by Creaser in 1930 indicated by O— and those of the author by O. Records of 
S. dorothae indicated by +. Three records of Creaser are not shown—one in California 
near the east border and two in southern Arizona. 
Maximum-sized specimens are about 18 mm. in length, and some 
specimens not more than 10 mm. long are mature. The species seems 
comparatively smaller than S. teranus. I have one large male of the 
latter species, 29 mm. in length, taken in a large sink pond in New 
Mexico, south of Santa Fe, and a number of specimens from a pond in 
