83 



and other manure beetles; among H37menoptera, Eucoila im- 

 patiens Say on Horn-fly and other dung-Diptera, and a new 

 species of Perissopterus, the last from China, bred from the Coccid 

 Lepidosaphes uhni (Linn.) on Camphor, and sent by Mr. Com- 

 pere, all the others being sent by Mr. Koebele. He also exhibited 

 leaves of a Cycas infested by a Coccid, Chrysoniphalus aonidum 

 (Linn.), also from China. Many of the Coccids were perforated 

 by the exit holes of four or six parasites, a species which has not 

 been seen thus far. The plant was confined in a cage in the 

 Lisectary with local plants infested by the same Coccid. 



Dr. R. C. L. Perkins then presented " Notes on a collection 

 made at Kilauea, Hawaii, during July," and exhibited specimens.* 



Papers. 



Observations on the Life History of Oiiarus koanoa Kirkaldy. 



By O. H. SwEZEY. 



On August 12th, 1906, while digging for insects among the 

 decaying leaf-bases and fibrous matter of tree-fern trunks, in 

 the forests of Mt. Tantalus, I discovered nymphs of some species 

 of leaf-hopper, which, on rearing, proved to be Oiiarus koanoa. 

 The nymphs were in cavities or tunnels lined with a white fibrous 

 material which resembled mold, or spider's web, and which is an 

 excretion from the terminal abdominal segments of the nymph. 

 Each nymph had a tuft or brush of straight fibers of this ma- 

 terial, extending backward and slightly upwards, and spread 

 somewhat fan-shaped. It is probably rubbed off accidentally 

 in the movements of the insects, and serves to aid in hiding or 

 protecting it. It is rapidly replaced. A specimen from which 

 it was entirely removed, had it completely produced again within 

 24 hours. 



The full-growth nymph is about 5 mm. long, and 2 mm. wide, 

 about even width throughout ; the tuft is from 2 to 5 mm. Whole 

 insect whitish, with pale greyish markings on the thorax, and 5 

 dorsal bands on the abdomen in front of the cottony tuft. Eyes 

 dark brown, partially hidden behind projecting margins of the 

 frons. Rostrum extends beyond 2nd abdominal segment. Sen- 

 sory pits are very numerous ; a row near the margin of frons, many 



*This has since been incorporated in Dr. Perkins' Presidential ad- 

 dress. — Eds. 



