CAMBARUS. 9 



tus G-ir. 1 consider to be the Southern and Western form of C. Blandingii 

 Harlan (= G. acutus, var. B, Hagen); G. robustus, a variety of G. Bartonii. By 

 •some error the descriptions of G advena and G. Garolinus 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, winch 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. Tn 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: — G. pellucidus, 

 a male, form 1. C. affinis, 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 G. spinosus Bundy. (See p. 87.) G Bar- 

 tonii: ••Erichson's types are a male, form II., and young female from South 

 Carolina, Cabanis, and, so far as 1 saw, both are the young of G. latimanus." 

 G. Cubensis : " Three males, form I., and two females, agreeing with Erich- 

 son's description. It belongs probably to Group II." (See p. 51.) 0. Caro- 

 lina : " Erichson's type, from South Carolina, Cabanis, is a male form I., 

 and. so far as I saw, my G. BwtoniL" Nevertheless, Erichson's description 

 accords well with Hagen's G Garolinus. (See p. 50.) The types of Erichson's 

 two .Mexican species, G. Wiegmanni and C. Mexicauus, could not be found in 

 the Berlin .Museum by Dr. Hagen, nor at a later day by Von Martens (Arch, 

 f. Naturgesch., 1872 i. 



The types of De Saussure's species, C. consobrinus from Cuba. G Aztecits 

 and G. Montezumce from Mexico, were also examined by Hagen in Berlin. 

 When the Monograph of the North American Astacidae was written. Hagen 

 had seen no specimens from Cuba or .Mexico, and befell into the error of 

 supposing (bat the peculiar species ( '. Mbntesumai 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. Astecus : Saussure's 

 types. The male, first form, and female, from Mexico, seem to be ('. Mexi- 

 canus Kriebs.. with nearl\ cylindrical bauds. The second form, with more 



