1796. . — Index alphabetieus in Entomologiuni, sys- 



teuiatieani emendatnm et auctaum, ordines, genera et species con- 

 tineni. P. 69. 



1801. . — Systema Eleutheratorum secundum ordi- 

 nes genera, species, ad.jectis, synonymis, locis, observationibus, des- 

 criptionibus. Kilac. Biblopol. acad. 1, p. 484. 



1808. Olivier. — Entoiuologie on historic naturelle des insectes, avec 

 leurs caracteres generiques et specifiques, leurs description ; leurs 

 synonymic et leur figure enluminee Coleopteres, Paris, Baudenin VI, 

 p. 626, t. 2. f. 27. 



1848. Sturm. — Catalog seines Kafer, Saunlong Xurnb. p. 281. 



1868. SuFP^RAiN, E. — Yerzeichniss der von Dr. Canalach auf del 

 Insel Cuba gesamelton chrysomelinen. Wiegm. Arch. 1, p. 196. 



1875. Herold, E. V. — Ueber cinige amcncanische Haltica — (grap- 

 tod(M'a ) — Arten, p. 66-67. 



1880-1892. Jacoby, M. — Biologia Centrali Americana, Coleop. VI, 

 p.-irt 1. p. 295. 



SCALE-FEEDING HABITS OF A PORTO RICAN MILIPEDE. 



KJuxocricus arhorcus (Saussure). 

 By K. T. Cotton, Assistant Entomologist, Insular Experinieiit Station. 



While investigating the feeding-habits of some of the common 

 millipedes <»f the Island, to ascertain whether or not they were injn- 

 i-ious to truck croi)s, I \v;is surprised to find that one of the species 

 had the very interesting luil)it of feeding on the ]inr]ile scale of citrus, 

 Lc pido.sa ph es heel' ii. 



This millipede is ;i iMi-ge. dai'k ■■('(Idisli-l)rowii form ;ibout SO mm. 

 long. Dr. K. V. ('luiiiihcrlin of tlic .Museum of Coui]);irative Zoology, 

 Cfiniliri(lg(\ .M.'iss.. luis vci-y kindly identified it for mc ;is Ithiiincriciis 

 (irhoicus ( Sdiis.siirt ) i\]n\ says that it is known fi'oiii scvci'al other 

 West Indian Islands, St. Thomas, St. Croix, Antigua, etc. 



it was while walking through a citrns giove at Kio I'iedias. P. H., 

 that my attention was attracted by seeing several specimens of this 

 millipede, among the hfjinelies of the grape-fruit tre*- that was heavily 

 infested with the pui'ple scale. Pausing to watch them for a few 

 minutes, I noticed that they were feeding voi-aciously <mi the srjiln. 

 and smooth, clean patches on the scale-infesled hi'anches imlicated 

 wliei'c they had tieen at work. Tiansfci'ring them to the lal)oi'atory 

 1 placed them on gi'ape-fi'uit twigs that wei'(^ completely co\'ered wilh 



175 



