1877.) 273 



DIAG-NOSES OP FOUE SPECIES OF DORYPHOBA FROM COLUMBIA. 



BY JOSEPH S. BALT, F.L.S. 



DOETPHORA HabOLDI. 



Ovata, postice paulo attemiata, x^alde convexa, nigra, nitida ; elytris sub-seria- 

 tim punctatis, jlavis ; singulatini siiturd anguste, fascvl laid erosA utrinque ab- 

 breviatd, ante medium positd, vittisque quatuor pone medium, exteriori geminatci, 1 — 2 

 et 3 — 4 ad basin, 2 — 3 ante apiceni conjunctis, nigris. Long. 8 lin. 



DOETPHOEA PULCHELLA. 



Oblongo-ovata, coEruleo-nigra, nitida; thorace tenmssime, ad latera magis 

 distincte, punctato ; elytris metaUico-cyaneis, minus fortiter punctato-striatis ; in- 

 terspatiis 2>lanis, 3'*" et 9'^" paulo latioribus, apice conjunctis , Jlavis, limbo basali 

 inter vittasjlavo. Long. 5f lin. 



DOEYPHOBA BIVITTATICOLLIS. 



Oblongo-ovata, valde convexa, fulva, nitida, antennis (basi exceptd), tJwracisque 

 vittis duabus, basi et apice abbreviatis, nigris ; thorace irregulariter punctato, ad 

 latera variolosa ; elytris confuse punctaiis. Long. 8^ lin. 



DOEYPHOEA IKGENUA. 



Ovata, convexa, rufo-picea, nitida, antennis (basi excepts) nigris ; thorace sat 

 fortiter punctato, maculis quatuor, transversim positis, nigris ; basi utrinque piceo- 

 tinctd ; elytris sat fortiter punctato-striatis, striis gemellatis, ad latera confusis ; 

 piceo-ceneis, singulatim punctis duobus basalibus, vittA submarginali, altera subsutu- 

 rali, basi abbreviatd f vittis apice conjunctis) , fascidque propie medium positd, ad 

 vittam exteriorem adfixd, intus abbreviatd, Jlavis. Long. 5 lin. 



Wai-wick : April, 1877. 



ON STRIDULATION IN SOME LEPIDOPTEBA—EETEBOCEBA. 

 BY A. n. SWINTON. 



It ia not very generally known, I believe, that a musical moth, 

 belonging to the Sesiidce, is found in North America. The following 

 account is given by Dr. George Gibb, in the " Canadian Naturalist 

 and Geologist" (vol. iv, p. 121). — "I liavc heard a stridulous sound 

 emitted by many species of the Sphinx or hawk-moth tribe, captured 

 generally in the evening twilight. This sound is something like the 

 squeaking of a mouse or bat, and was strikingly produced in a 

 beautiful and rax-e species of the humble-bee hawk-moth, the Sesia 

 Pelasfjus. This squeaking noise continued as long as the creature 

 remained alive, and was much louder than in any other of the 

 numerous Sphinges it was my good fortune to capture." And in 

 another place he says : " I retained one I captured myself for some 

 time alive, to hear its murmurs." 



