94 



ilies Elateridae, Staplijlinida' and miscellaneous other families, 

 collected for the ^'Fauna Hawaiiensis," have been received at 

 the Bishop Museum (i. e. the Bishop Museum's share) worked- 

 out and labelled. It was by comparing my specimens of this 

 moth with those in the collection that I have learned its true 

 identity. Those in the .Museum collection were collected by 

 Dr. Perkins at Olaa, Hawaii. 



Notes on Dromaeolus arduus Sharp [Col.] 



BY OTTO H. SWEZEY. 



On July 5th, 1909, while Mr. Fullaway and myself were 

 collecting insects on one of the ridges of Palolo Valley, Oahu, 

 we found a large number of the larvae of what proved to be this 

 species of Eucnemini. They were in the wet, soft, rotten wood 

 of dead stems of Scaevola chamissoniana. Many were full- 

 grown and had formed elongate oval cells in the wood for pupa- 

 tion, and were lying therein folded in a loop with the two 

 extremities near together. A few cells were found with pupse 

 in, and from these adults emerged beginning July 19th and for 

 a few days following. 



The larvse of this subfamily of Elateridse are quite remark- 

 able in structure. They have no legs, and it is very difficult to 

 find any mouth-opening in some of them. The mandibles are 

 peculiar in that they open outward instead of closing together, 

 as is the usual way. The head is usually armed with saw-like 

 teeth, which assist in burrowing in wood by free movements of 

 the head. They have been but little studied. Dr. Sharp figures 

 the larva of an Hawaiian species in The Cambridge N^atural 

 History, Insects, Part II, p. 260. It does not give all the details 

 present in the larva of arduus. 



Full-gro-WTi larva of ardinis — 17-18 nnii. ; pale yellowish, 

 head mostly brown, also a little brown at posterior extremity; 

 nearly cylindrical, somewhat compressed, especially at the ex- 

 tremities ; moderately constricted between segments; head 

 strongly compressed to a sharp margin, narrower than succeed- 

 ing segments, front margin nearly straight for a short distance, 

 then evenly curved around each side, which is armed with 7 

 slightly backward-projecting teeth or serrations; mandibles ob- 



Proc. Haw. Ent. Soc. II, No. 3, May, 1910. 



