THE SPECIES OF AEGLA — SCHMITT 495 



less subequal scabrous tubercles, except the first which is quite the 

 largest; anterior margin of joint medially produced, forming a den- 

 ticulated lobe ; these denticulations are usually carried outward along 

 the anterior margin of the merus, scarcely ever and perhaps only 

 adventitiously along anterior margin inside the lobe itself. Inner 

 margin of ventral surface of ischium armed with from four to six 

 conical corneous-tipped tubercles or spines, of which the most anterior 

 and posterior are more or less subequal and the largest; often the 

 first spine is twinned (the twin being smaller and on the posterior 

 slope of the anterior spine proper and included in the four to six 

 count) ; more rarely is the posterior, or one of the intermediate and 

 always smaller spines twinned (as in left ischium of type, fig. 57, d). 



Anterior dorsal angle of epimeron of second (in lateral view, ap- 

 parent first) abdominal somite evenly rounded off, anterior margin 

 below angle straight. 



Sternite between bases of chelipeds with anterolateral angles pro- 

 duced, tuberculif orm ; on median line near anterior margin of this 

 sternite there is a low conical elevation topped by a small, usually 

 acute corneous spinule. 



Holotype. — The second largest male, U.S.N.M. No. 80024, of a lot 

 of 4 males and 1 female, measures 29 mm. in length of carapace and 

 rostrum; the female measures 20.5 mm.; the smallest male, 17.5. 

 All were collected at Arroyo, Territory of Neuquen, Argentina, by 

 John W. Titcomb, November 12, 1903, while conducting a fisheries 

 survey in that vicinity for the Argentine Government. 



Remarks. — This species is certainly closely related to the following, 

 yet differs from it in several important points. The separate descrip- 

 tion of the latter seems fully warranted. 



Distribution. — In addition to the type lot, I have examined a second 

 lot of material, 5 males and 1 female, ranging from 18 to 24 mm. 

 in length of carapace and rostrum together. These specimens were 

 collected the same day as the type lot, November 12, 1903, by Mr. 

 Titcomb at Covunco [?] or in the [Rio] Covunco; the original label 

 is somewhat rubbed and partly illegible, but the date and "Neuquen" 

 [Territory ?] are unmistakable. 



AEGLA AFFINIS, new species 

 FiGUBB 58 ; Plate 27, F 



Description. — I have seen but one specimen of this species, the 

 unique holotype, a male of fairly large size, measuring in length of 

 carapace and rostrum 31 mm. Most of its legs are broken, and the 

 chelipeds are detached; in addition there is another loose cheliped of 

 a specimen of probably the same size. 



435661—42 5 



