THE SPECIES OF AEGLA — SCHMITT 507 



merited. Inner margin of ventral surface of ischium may have as 

 many as three or four low swellings, the anteriormost of which is 

 the larger and somewhat conical tuberculiform with tiny corneous 

 tip; sometimes second and third swellings, though considerably 

 smaller, are similarly developed; in the neotype only the ultimate 

 and penultimate of these swellings are developed; though small, each 

 is corneous tipped; the ischia of most specimens seem to be armed 

 as in the neotype. 



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

 parent first ) abdominal somite acutely produced and corneous tipped ; 

 anterior margin below acute anterior dorsal angle straight, or at 

 most only slightly concave. 



Neotype. — A male of 24 mm. in length of carapace and rostrum 

 taken together, one of a lot of 14 males and 17 females (12 ovig.) 

 contained in the collections of the Museum of Comparative Zoology 

 (M. C. Z. No. 10478) collected "dans une riviere pres de St. lago-de- 

 Chile," collector and date unknown. 



Remarks. — This species in some respects seems to be very much 

 like A. concepcioTiensis., though, so far as I am aware, never attaining 

 so large a size, but throughout its several characters lack the definite- 

 ness and distinctness of that species. A. concepcionensis., except 

 in very rare and obviously not typical instances, lacks anything re- 

 motely resembling the usually abrupt offset between the orbit proper 

 and the anterolateral spine of A. laevis; moreover, the anterolateral 

 spine of its carapace is stouter and more flattened triangular and the 

 anterolateral lobe is more of an alate expansion in comparison to the 

 more slender, more conically circular (in cross section) spine and 

 more triangular anterolateral lobe of the carapace of A. laevis. The 

 second and third hepatic lobes of A. laevis are the better marked. 

 Its rostrum is the more truly Ungulate of the two, and is more 

 bluntly carinated. The rostrum of A. concepcionensis is the nearer 

 an elongate isosceles triangle in shape. The palmar crest of A. 

 concepcionensis has nothing like the right-angled notch intervening 

 between the anterior end of the crest and the anterior margin of the 

 palm in advance of the crest as in A. laevis; moreover, the palmar 

 crest of A. concepcionensis is not at all longitudinally troughed or 

 excavate in any manner suggestive of that state of affairs in A. 

 laevis. 



A. laevis talcahuano^ which follows, differs from both A. laevis and 

 A. concepcionensis in that the movable finger is wholly without a 

 trace of a lobe, spined or not, on its outer margin near the base. 



Distribution. — Besides the lot of material from which the neotype 

 has been selected, I have seen two small ovigerous specimens (19 and 

 21 mm. long) from the Kio Maipo (M. C. Z. No. 1417) collected by 



