THE MONTHLY BULLETIN. 



163 



This insect has quite a wide oriental distribution and it is hoped that 

 California fields will ever remain free from it. 



Following is a short life history and description taken from Bulletin 

 No. 22. Hawaii Agricultural Experiment Station, by D. T. FuUaway: 



Fig. 25. — Near view of infosted portion showing the extent of in- 

 festation by Cryptorhyjichus batata: (Photo tay Chatterley. ) 



LIFE HISTORY. 



The eggs of tlic wcc\il are laid on the surface of the sweet potato 

 and the larva' or grubs bore into the interior. The larval stage is some- 

 what pi-olonged and is passed entirely within 

 the potato, which becomes badly riddled and 

 decayed. The larva^ pupate inside and later 

 the adults emerge. 



This IS a minute species of ('rijptorJiyn- 

 clnis, and differs somewhat from the type 

 (if the genus if we regard the ('. lapathi as 

 such — though not sufficiently, as it appears 

 to me, to require removal from that section. 

 Its form is more elongated, and its scutellum 

 is so minute as to require the aid of a strong 

 lens to detect it; the insect, nevertheless, 

 has well developed wings; the rostrum is 

 stouter, and is inserted in a very deep rostral 

 groove, which terminates between the coxa? 

 of the anterior pair of legs; the scape of 

 the antenmp is shorter and stouter, the basal 

 joint of the funiculus is also stouter, the 

 second joint is of an elongate obconic form; 

 the remaining joints are also obconic, but 

 very short; the club is tolerably well developed and of a short ovate 

 form; the femora are rather less stout, and very indistinctly toothed 

 beneath. 



Fig. 2 6. — Larva of Crypto- 

 rhynchus batatw, eight 

 times natural size. (Orig- 

 inal. ) 



