5,08 PROCEE'DENGS OF THE NATIONAL MUSEUM vor,. 91 



Lieutenant Gilliss, of the United States Naval Astronomical Expedi- 

 tion of 1849-52, and determined by William Stimpson; three small 

 males (15 to 21 mm. long) and one female (17.5 mm.) from near 

 Melipilla, Province of Sanitago, Chile, which were collected for me 

 by Dr. Carlos E. Porter ; and two lots of two ovigerous females each, 

 both belonging to the Museo Argentino and carrying the same cat- 

 alog number (M. A. C. N. No. 4673) but with no indication other than 

 that they were collected by F. Silvestri in Chile. 



Since the foregoing was first written I have seen three additional 

 specimens of A. laevis. The most interesting of these is one of Dana's 

 original specimens, already referred to (pp. 433, 436) . Beyond the re- 

 marks there it is to be noted that the right-angled notch formed be- 

 tween the anterior end of the palmar crest and the anterior dorsal 

 margin of the palm is no better developed than in the subspecies 

 talcahuano below, and that the armature of the ventral inner margin 

 of the ischium of the right cheliped closely approximates that of the 

 figured neotype. The specimen in question is 21 mm. in length, cara- 

 pace and rostrum taken together, and carries Acad. Nat. Sci. Phila. 

 no. 486. 



The other two (Acad. Nat. Sci. Phila. no. 1243) are both females, 

 18 and 22 mm. in length of carapace and rostrum, respectively. In 

 the smaller specimen a small extraorbital sinus and a tiny orbital 

 spinule are present on the right side ; on the left side the offset usually 

 found on the inner margin of the anterolateral spine in the absence 

 of an orbital spine or spinule is wanting. The larger specimen has no 

 orbital spinule on either side, but there is instead an appreciable off- 

 set to the inner slope or margin of each of the anterolateral spines, a 

 more abrupt offset on the left than on the right side. The hepatic 

 lobes are rather well marked for A. laevis; the anterior dorsal epimeral 

 angles in both specimens are furnished with a small corneous spinule 

 or sharp scale. In the larger specimen only, the sternal plate between 

 the chelipeds carries a low, acute, conical, corneous scale, probably 

 adventitious. 



AEGLA LAEVIS TALCAHUANO, new subspecies 



FiGUKB 62 ; Plate 28, B, C 



Description. — ^Very near A. laevis in all particulars except that the 

 movable finger is wholly without trace of a lobe, whether spined or 

 not, on its outer margin near the base ; the palmar crest, though low 

 and very remotely suggestive of the subdisciform crest of odehrechtii 

 and its subspecies, is much narrower than in either of those forms; 

 margin of the crest, as compared to A. laevis, is scarcely to be de- 

 scribed as obsolescently serrate; the notch corresponding to the 

 sharply defined, approximately right-angled one at the anterior end 

 of the palmar crest of A. laevis is only obscurely and shallowly 



