CAMBARUS. 9 
tus Gir. I consider to be the Southern and Western form of C. Blandingii 
Harlan (= C. acutus, var. B, Hagen); C. robustus, a variety of C. Bartonii. By 
some error the descriptions of C. advenu and C. Carolinus are transposed in 
Hagen’s Monograph. 
It is exceedingly difficult to discriminate between the different species 
of North American Cambari, even with the help of the most careful descrip- 
tions and figures, which are rarely afforded us by the older authors. It 
therefore becomes a matter of the first importance to examine type speci- 
mens whenever it is possible. In September, 1870, Dr. Hagen examined 
the types of some of Erichson’s and De Saussure’s Cambari in the Berlin 
Museum, and has kindly placed in my hands the notes which he took con- 
cerning them. Of Erichson’s types he found the following : —C. pellucidus, 
a male, form I. @. affiis, a female from Carolina, collected by Dr. Cabanis. 
The locality is new. Cabanis informed Dr. Hagen that all the Cambari which 
he collected were taken in a rivulet in the northern part of South Carolina, 
near Greenville, at a farm called Tiger Hall. I suspect that this specimen 
may be the nearly related species C. spinosus Bundy. (See p. 87.) C. Bar- 
toni : “ Erichson’s types are a male, form IL, and young female from South 
Carolina, Cabanis, and, so far as I saw, both are the young of C. datimanus.” 
C. Cubensis : “Three males, form IL, and two females, agreeing with Erich- 
son’s description. It belongs probably to Group II.” (See p. 51.) @ Caro- 
linus : “ Erichson’s type, from South Carolina, Cabanis, is a male form I., 
and, so far as I saw, my C. Bartow.” Nevertheless, Erichson’s description 
accords well with Hagen’s C. Carolinus. (See p. 56.) The types of Erichson’s 
two Mexican species, C. Wiegmann’ and C. Mevicanus, could not be found in 
the Berlin Museum by Dr. Hagen, nor at a later day by Von Martens (Arch, 
f. Naturgesch., 1872). 
The types of De Saussure’s species, C. consobrinus from Cuba, C. Azfecus 
and C. Montezume from Mexico, were also examined by Hagen in Berlin. 
When the Monograph of the North American Astacidee was written, Hagen 
had seen no specimens from Cuba or Mexico, and he fell into the error of 
supposing that the peculiar species C. Montezume was the same as Erich- 
son’s C. Mexicanus. This mistake was rectified on seeing Saussure’s types. 
C. consobrinus : ‘* Saussure’s types, two females, dry. A peculiar species, or 
a young state of C. Cubensis. Rostrum bidentate.” C. Azfecus : Saussure’s 
types. The male, first form, and female, from Mexico, seem to be C. Mez- 
canus Erichs., with nearly cylindrical hands. The second form, with more 
9) 
v4 
