226 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 104 



cell one-half to 1 inch to the side and below the burrow. One of the 

 specimens in the cells, a prepupa, pupated on June 25. The position 

 of the pupal cell in relation to the burrow is diagrammed in plate 10, 

 figure 1. 



Further excavation on June 26, 1951, yielded a male darlingtoni in 

 an old burrow 7 inches deep, and a male pupa in a cell 12 inches deep, 

 1 inch from the humus-packed burrow. A second pupa was taken 

 in a cell one-half inch from the burrow at a depth of 10^ inches. No 

 additional specimens were found then or on later visits. 



The life cycle of Bolboceras darlingtoni, in North Carolina, can be 

 sketchily summarized as follows: Egg laying occurred in mid-April 

 with the incubation period lasting approximately 11 or 12 days. The 

 first instar (one example) occurred in early May, remaining as a first 

 instar for 18 days. From May 18 to June 14, a period of 30 days, 

 the larva was in second-stage. The exact length of time spent as a 

 third instar was not obtained, but appeared to be from 2 to 3 weeks, 

 with a prepupal stage of about 3 or 4 days. Length of pupation in 

 one case was 24 days, the adult appearing on July 14 and taking a 

 week or more to loose its callow appearance. At Raleigh, some adult 

 feeding on Rhizopogon nigrescens Coker and Couch was noted in 

 October. B. darlingtoni overwinters in the adult stage and becomes 

 active on warm winter evenings. The period of oviposition was in 

 the spring. 



The time of mating was not ascertained, nor could it be definitely 

 decided whether the burrows containing the larvae were single tubes 

 or whether they were branched. If asked to hazard a guess on the 

 latter, I would say that the burrows were branched, basing the guess 

 on the following observation: On the surface of the 6 square feet dug 

 up, there were only 4 push-ups, while there were 11 larvae found in 

 the burrows under these push-ups. 



Description of the immature stages of Bolboceras darlingtoni is 

 based on the following material, all of which was collected at Faison, 

 N. C, by P. O. Ritcher and H, Howden: One egg collected Apr. 19, 

 1951, reared to third instar; nine third-stage larvae collected Junel9, 

 1951; three being allowed to pupate, one emerging as adult male 

 Aug. 26, 1951, before other pupae were preserved; two pupae col- 

 lected June 26, 1951. 



Third-stage larvae of darlingtoni differed from Ritcher 's (1947, p. 

 13) description of simi in the following respects: Maximum width of 

 head capsule 2.1 to 2.4mm. Frons on each side with 2 or 3 posterior 

 frontal setae, 2 setae in each anterior angle, 3 exterior frontal setae, 

 and 1 or 2 anterior frontal setae. Antennae similar to those of simi 

 and liebecki (pi. 6, fig. 3), as are the mandibles and maxillae. Hypo- 

 pharynx (pi. 6, fig. 8) slightly asymmetrical, with oncyli rather widely 



