306 



have never been tabulated. Some of the species are twig- 

 borers, the adnlts mining in the drying twigs of various 

 plants. The adults are commonly associated in small colonies; 

 whether these are the descendants of one stem mother which 

 had founded the colony, or whether on account of their abund- 

 ance, several are associated in working the suitable twigs, 

 I cannot say. The entrances to their mines are usually at 

 the nodes of the twigs or they may start at the ends or from 

 the ends of the burrows of Sinoxylon conlgerum or Schisto- 

 ceros cormdus. From the entrance tunnels usually rim in both 

 directions, either just under the bark or in the pith, or if 

 associated with the Bostrychid beetles, they may follow the 

 larval tunnels of the latter. In any case the mother beetle, 

 when she has excavated her tunnel to suit her taste, lays five 

 or six eggs very large in proportion to her size. The larvae 

 wliicli hatch from these appear to live upon wood which they 

 excavate for themselves, or possibly they are assisted in this 

 by the adults. These larvae are of the common form of beetle 

 grul)S in the group but are very small and feeble. 



Dr. Perkins records in tlie Fauna ITawaiiensis a Ceph- 

 alonomia attacking these. I am uncertain whether the species 

 referred to is the one whose habits are discussed here, or a 

 brownish one found by Mr. Swezey associated with a species 

 of HypotJi.eiiemus living in the stems of Bermuda grass. 



I ha^-e never been ah\e to locate living material of any 

 such species in desultory examination, but on May 30, 1919, 

 I swept a small black Ceplialonomia in the Waikiki marshes 

 which belonged to a species unrepresented in the collections 

 here. Again on examining some twigs of Eupliorhia multi- 

 formis infested by three or more species of Hypofhenemus 

 (s. 1.) which had been brought in from Ewa Horal Plain on 

 June 8 and 10, 1919, four females were discovered, three of 

 them associated with small white cocoons in the Hypothen- 

 emufi tunnels. I determined to attempt breeding them arti- 

 ficially. 



In order to have control of mv material I cut into twio-s 



