DESCRIPTION OF THE LARVA OF DASCYLLUS 

 DAVIDSONII LEG., AND A RECORD OF ITS LIFE 

 HISTORY. 



BY J. J. RIVERS. 



Form large, robust, elongate, attenuate ventrally, 

 eyeless, hexapod; segments 12, exclusive of head; color 

 testaceous; texture corneus ; length i}:^-!}^ inches. 

 Head wider than long, convex: gen« stronglv round- 

 ed; sides gently rounded; front margin truncate with 

 slight sinuations ; from the front angles arise four jointed 

 antenna, the second joint being as long as the other 

 three, the basal joint connate with the head, and the 

 apical joint can onU^ be seen peeping out from the 

 third by being highly magnified; a large trapezoidal lab- 

 rum projects from the front margin; the front margin of 

 the labrum is deflexed and fringed with bristles. Man- 

 dibles robust : articulating with the front edge of the head ; 

 apex bifid (plate II, fig. V^, upper side) ; the cutting sur- 

 faces are broad, bearing both crushing and tearing teeth 

 (fig. Va) ; the large dark character at the base is boldly 

 raised above the general line of the cutting edge. The 

 masticating surface is sunken except at the basal inner 

 angle, but it has a reflexed margin (fig. Va, d) ; the space 

 marked (V^a, e) is a sunken hollow bearing a transparent 

 film, which alone separates the outer from the interior 

 walls ; near the middle of the mandible occur two needle- 

 like teeth, one of which is very aciculate (fig. Va, f). 

 Maxilla (fig. HI), bears a bidentate lacinia (A), a robust 

 galea (B) , and a three jointed palpus (C) ; labium bearing 

 its two jointed palpi, (fig. VI). Leg showing peculiar joint; 

 (fig. VII). Interior of labrum showing epipharynx, 

 (fig. II). At the entrance under the front margin is a tuft 

 or boss of stiff bristles (fig. II, g) ; immediately behind 



2d See. Vol. IH. April 23, 1891. 



