1972] 
Kurczewski & Evans — Bothy nostethus 
97 
Fig. 7. Cocoon of Bothynostethus distinctus with beetle elytra attached 
to proximal end. (Photo by D. J. Peckham). 
Cocoon. The cocoon of this species is oval-elongate in shape and 
dark brown in color. The walls consist of silk and possibly other 
oral secretions, with various-sized sand grains embedded externally 
(Fig. 7). Several beetle elytra were attached to the proximal end, 
i. e., the end nearest the entrance to the cell. The cocoon in Fig. 7 
measured 9.5 mm long. 
Description of the Mature Larva 
Our description of the mature larva of Bothynostethus distinctus 
is based on two specimens taken from freshly made cocoons. These 
larvae had not yet passed their meconia, and, aside from the more 
compact body shape, they showed no obvious wear or other structural 
modifications. 
Body (Fig. 9). Length 7.5 mm; maximum width 2.8 mm. 
Robust, slightly curved ; pleural lobes very prominent, especially 
on thorax; prothorax with a pair of additional finger-like lobes that 
extend forward laterad of head ; apical abdominal segment rounded, 
anus distinctly ventral and pre-apical. Spiracles (Fig. 15) small, 
lightly pigmented; atrial walls lined with weak, irregular polygons, 
opening into subatrium simple, unarmed. Integument densely 
spinulose on thoracic venter, but dorsum barely so; thoracic seg- 
ments each with a transverse dorsal row of 10 to 12 setae (up to 
30 [a long) ; pleural lobes and accessory pro thoracic lobes smooth, 
but each terminating in 2 or 3 short setae. 
Head (Fig. 8). Width .86 mm; height, excluding labrum, .80 
mm ; largely unpigmented except mandibles ; front longitudinally 
depressed just mesad of each antennal orbit; coronal suture and 
parietal bands barely evident. Antennal orbits of moderate size, 
