' r 



II); 



lUJLLKTlN ;{l, IJNITlil) STATK-S NATIONAL MIJ.SKIJM 



wards, nearly coiitiimous medially. Tlie panisplieiioid (eetli staml on 



two narrow plates, wbicli arc well separated, especialjy behind, and are 



shortened; anteriorly they only reach to near the niiTldlc oftlic orbits. 



Tiie mandibular teeth present pecularitics in the male, by which it may 



l)e readily distinguished from the female. In a large number of speei- 



mens the oral commissure is but little undulate, and the mandibular 



teeth though longer medially, arc continued to near the basis of the 



coronoid i)rocess. The nuilcs exhibit a strongly flexuous commissure, 



and the alveolar margin of the mandible is dee])Iy concave below the 



front of the (ubit, an<l is edentulous. The distal portion is abruptly 



convex and is armed with long teeth. The margin is slightly concave, 



anterior to this point, ami finally rises again at the symphysis, Miiicli is 



l»roiiiin('iit and protected externally by a pad of crypts as in />. /kscun. 



The structure of the males is in the luaudibular dentition (juite that 



of the genus Autodax ; the A. fcrrcits presenting the characters but 



little more stiongly. No such sexual dil!ereiu;e can be found in the 



I), /'itsrd, though the commissure only may be sometimes more (Icxu- 



ous in uuiles. The Jaws antl dentition in the 7>. iiifjra do not dilfer in 



t!i(! two sexes. I have observed that two of the many males of />. ovhro- 



^>//fm possess the female denition. The tongue in I). ochviq)hnt( is an 



elongate oval, cousideiably free behind. 



The color of females is a bright brownish yellow, fading to dirty white 

 below, with a dark brown shade on each side from the eye to liie end 

 »)f the tail, which is daikest above ami gives the dorsal space the char- 

 acter of a band. There is an irregular scries of brown dots along the 

 vertebral line. .Males are rather larger and usually darker in color ; 

 thus the dorsal baml is brownish, the lateral band blackish, and tlu^ 

 dorsal spots more distinct. In most speciuu'us of both sexes there is a 

 light band from the eye to the rictus oris, and the belly is idways im 

 maculate ; the gular region nearly always. The testes and v is deferens 

 are covere<l with black i»igment ; no i)igment on the peritonu'um ol the 

 female. 



'^^?^ 



143 5 



I''|ii. 47. D('Siiiiiijiiathiiii<irliriipI((r(t, No. (i,«Ul. .Miailvillr, Ta. ; .], ;. Ki;;. -, c/ ; 2(1, 9 . 



This species attains scarcely half the size of the D./iisni, as indi(;ated 

 by the numerous females with develo))ed eggs in our colli ctions. As 

 the eggs are ((puil in size to those of />. fitscn when roady to be dis- 

 charged, and as the species is only half the size of the same, the eggs 

 in the oviduct of a gravid fenuUe atone tinu', are oidy half as nnnu-rous. 

 I have oidy found from (5 to 10 in />. ovhrophmt, in each oviduct, while 

 from 18 to 30 may be counli d on one side in D. fifscd. 



('aljl(, 

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