366 CRAYFISHES. 
Its range is now known to include the five states, Texas, Arkansas, New Mexico, 
Oklahoma, and Kansas. 
CAMBARUS GRACILIS Bundy. 
New localities:— Iturnots: Abingdon, Knox Co. (U.S. N. M.); Oquawka, 
Henderson Co. (U. 8. N. M.). 
CAMBARUS HAGENIANUS Faxon. 
Plate 1; Plate 7, Fig. 1, 7. 
Cambarus carolinus HAGEN, nec Erichson. 
Cambarus hagenianus Faxon, Proc. Amer. Acad., 1884, 20, p. 14. 
This species has been hitherto known only through the type specimen in the 
Museum of Comparative Zodlogy (No. 232), a male of the first form received 
early in the history of the Museum from Professor Lewis R. Gibbes of Charleston, 
8. C. The United States National Museum has recently received it in ample 
numbers from the Agricultural College, Oktibbeha Co., Miss., and also from 
Muldon, Monroe Co., Miss., and Farmdale, Ala. It is:a pest to the cotton 
growers of these regions, riddling the fields with its burrows, and devouring the 
young plants; to.a less degree it is destructive to young blades of maize or Indian 
corn.! 
Hagen’s Crayfish attains to a length of three inches. It is nearly related 
to C. gracilis Bundy, replacing that species in more southern localities... In C. 
gracilis the sides of the rostrum are more nearly parallel; the sub-orbital angle, 
which is pronounced in C. gracilis, is wanting in C. hagenianus. The branchio- 
cardiac lines, although contiguous in both C. gracilis and C. hagenianus for a 
considerable distance, obliterating the areola, are united for less distance in the ! 
former than in the latter; the abdomen is much broader in C. gracilis, and the 
longitudinal rib on the upper side of the inner branch of the last pair of abdominal 
appendages terminates in a spine which lies some distance from the posterior 
margin, while in C. hagenianus this rib extends clear to the margin, where the 
spine projects freely. The gonopods of the first form male are formed after a 
similar fashion in C. hagenianus, C. gracilis, and C. simulans; there are three 
terminal teeth (one of which is compressed or laminate) in C. gracilis and C. 
1See U.S. Depart. Agric., Rept. Bureau Biol. Surv. for 1911, p. 9; and A. K. Fisher, Crawfish as 
Crop Destroyers, Yearbook U.S. Depart. Agric. for 1911, 1912, p. 319-324, pl. 22. 
