ART. 9 SCORPIONS OF WESTERIT UlSriTED STATES EWING 23 



ISOMETRUS EUROPAEUS Linnaeus 



This long known and widely distributed species is remarkable for 

 the degree of sexual dimorphism shown. The female is of a rather 

 slender body, but in the male the postabdomen and appendages are 

 exceedingly slender. The postabdomen of the male is about twice 

 as long as the body and the hand is about four times as long as 

 broad. The general color is a reddish brown. The subaculear tooth 

 is long, sharp, and conspicuous. The length of the male is from 6 to 

 T cm. The species is frequently known under the name of /. macu- 

 latus De Geer. 



This scorpion is reported from many parts of the world. It occurs 

 in South America and the West Indies. In the United States it is 

 known from Florida and California. There are two specimens in 

 the National Museum, both from Key West, Fla. 



LITERATURE CITED 

 Baeeg, W. J. 



1924. The Effect of the Venom of Some Supposedly Poisonous Arthropods. 



An. Ent. Soc. Amer., vol. 17, pp. 343-352, 7 figs. 



1925. The Effect of the Venom of Some Supposedly Poisonous Arthropods 



of the Canal Zone. An. Ent. Soc. Amer., vol. 18, pp. 471-478. 

 Banks, N. 



1910. The Scorpions of California. Pomona College Journ. Ent, vol. 2, 

 pp. 185-190, figs. 80-81. 



BOREELLI, A. 



1909. Scorpioni raccolti dal Prof. F. Silvestri nell' America settentrionale 



e alle isole Hawaii. Bol. Lab. Zool. Port., vol. 3, pp. 222-227. 

 1915. Scorpioni nuovi o poco noti del Messico. Bol. Mus. Zool. and Anat. 



Comp. Torino, vol. 30, pp. 1-7. 

 Chambeklin, R. V. 



1924. The Northern Range of the Scorpion. Science, vol. 59, p. 64. 



COMSTOCK, J. H. 



1912. The Spider Book, 721 pp., 770 figs. Doubleday, Page and Co. 

 DE Mello Campos, O. 



1924. Os escoi-piones brazileiros. Mem. Inst. Oswaldo Cruz, vol. 17, fasc. 

 2, pp. 237-363, pis. 2-13. 

 EssiG, E. O. 



1926. Insects of Western North America, 1035 pp., 766 figs. Macmillan 



Co. 

 Jackson, H. V. 



1910. Interstate Medical Journal, vol. 17, No. 7. 

 Keaepejlin, K. 



1905. Die geographische Verbreitung der Scorpione. Zool. Jahrb. Jena, 

 vol. 22, pp. 321-364. 



1911. Neue Beitriige zur Systematik der Gliederspinnen. Jahrb. Hamb. 



wissensch. Amst., 2 Beih, vol. 28, pp. 60-108, 9 figs., 1 pi. 



POCOCK, R. I. 



1902. Arachnida-Scorpiones, Pedipalpi and Solifugae. Biol. Cent-Amer., 

 71 pp., 12 pis. 

 Smith, F. R. 



1927. Observations on Scorpions. Science, vol. 65, p. 64. 

 We:bster, R. L. 



1923. Scorpion in North Dakota. Science, vol. 58, p. 248. 



