510 Bibliographical Notices. 



not reach to tlie anterior ocellus, nor are any black dots leffc 

 at the sides of the eyes, 



$ . — Length about 4^ mm. 



Bright but lig'.it yellow ; mandibles tipped with rufous ; 

 liead yellow except a broad area from the vertex, a little in 

 front of anterior ocellus, to the occiput, which is dark green 

 and granular; cheeks yellow, the dark area not extending 

 downwards; antennae yellow, a dark dot on second joint 

 above ; thorax dark above, but yellow at sides and beneath, 

 except a dark mark just below wings; prothorax above with 

 a broad yellow margin ; nervures and margin of stigma 

 fus^coiis, third discoidal cell absent ; marginal cell broadly 

 but obliquely truncate ; legs yellow, hind tibias with a faint 

 dark shade above. Abdomen yellow with apex a little 

 reddened ; first segment black with two more or less 

 triangular yellow marks, and sides yellow; four straight 

 black lands, not reaching lateral margins, the first three 

 broad ; venter yellow, rufescent apically. 



S . — Length 3|-4 mm. 



In general similar to the female, but dark colour extending 

 a short distance down cheeks, leaving a narrow yellow line 

 next to the eye; flagellum, except last joint, fuscous above; 

 sides of thorax dark, but pleura with a very large yellow 

 patch anteriorly ; hind tibiae and tarsi behind, and a spot at 

 apex of their femora, dark brown ; apical part of abdomen 

 orange or brownish yellow, without bands ; there are four 

 well-formed bands. 



Hah. Alamogordo, New Mexico, at flowers of Dasylirion 

 Wheeleri, Watson, June G to 9, very many specimens {II. L. 

 Viereck) . 



University of Colorado, 

 Boulder, Colorado, U.S.A., 

 April 20, 1907. 



BIBLIOGRAPHICAL NOTICES. 



TJic Crawjishes of the State of Pennsijlvania. B)' Dr. A. E, Ortmann. 

 Memoirs of the Carnegie Museum, Pittsburg, Pa., vol. ii. no. 10, 

 pp. 343-523, 7 plates : December, 1906. 



Since Huxley, in a well-known paper, first placed the classification 

 of the Crayfishes on a morphological basis and showed the interest 

 attaching to their geographical distribution, much attention has 

 been given to this group of Crustacea. In particular, the very 

 numerous species occurring in North America have been the subject 

 of important memoirs by Faxon and others. Dr. A. E. Ortmann, 

 who is well-known as an authority on the higher Crustacea, has 

 produced, in the memoir under review, a study of the Crayfishes of 



