164 BULLETIN 182, UNITED STATES NATIONAL MUSEUM 



Records. — The following are the records known to me : 



Trinidad: (Leng and Mutchler, 1914; British Museum; Busck, in U.S.N.M. ; 

 Fauvel, 1902, as collaris), Mt. Tucuche (Darlington, in M.C.Z. and U.S.N.M.). 



South America: (Fabricius, 1801), Brazil (Lucas, 1857, as hicolor; Fauvel, 

 1865; Sharp, 1876, 18S7 ; Heller, 1898; Fauvel, 1902, as anthracinus and 

 collaris; Bernhauer, 1903), Glfi.vna (Fauvel, 1865), Venezuela (Bernhauer, 

 1903), Colombia (Fauvel, 1865; Sharp, 1887; Fauvel, 1902, as collaris; Bern- 

 hauer, 1903), Bolivia (Heller, 1898, as bolivianus; Fauvel, 1902, as collaris), 

 Peeu (Fauvel, 1902, as anthracinus and collaris; Plavilstschikov, 1929, as 

 bolivianus; British Museum), Abgentina ( Scheerpeltz, 1933). 



Central America: Nicaragua (Sharp, 1887; Fauvel, 1902, aa anthracinus), 

 Honduras (Fauvel, 1902, as anthracinus), British Honduras (Sharp, 1887), 

 Mexico (Fauvel, 1865; Sharp, 1887; Fauvel, 1902, as anthracinus). 



Specimens exaTnined. — I have seen 10 examples in the British Mu- 

 seum, 6 from the Museum of Comparative Zoology, and 6 in the United 

 States National Museum. 



Remarks. — At the present time I believe it is impossible to distin- 

 guish the four varieties that have been named. Further study, espe- 

 cially of series from southern South America, may modify this opin- 

 ion, but the specimens I have examined all appear to be typical 7n-axiJ- 

 losus. The variations in color have not been demonstrated to be more 

 than a color phase of irregular occurrence. 



I cannot find any record of the habits of this species. 



XXII. NEOTROCHUS, new genus 



Genotype. — Holotrochus cylindrus Erichson=7Veo^7'OcAi^s cylindrus 

 (Erichson) (designated here). 



Diagnosis. — Body elongate, cylindrical ; smooth, shining, glabrous ; 

 head not margined or impressed ; distal antennal segments transverse ; 

 labrum transverse, subtruncate anteriorly ; mandibles short, unarmed, 

 or with one or two blunt teeth on upper edge ; fourth segment of maxil- 

 lary j^alpus conical, as long as first three together ; mentum not trans- 

 verse ; gular sutures united ; prosternimi very narrowly produced be- 

 tween anterior coxal cavities, well below the coxae; anterior coxal 

 cavities open behind, coxae short but exserted, with transverse sulcus 

 on anterior face; middle coxal cavities separated by union of meso- 

 sternal and metasternal processes; mesosternum distinctly carinate; 

 metasternum generally punctate; abdomen not margined; first and 

 second sternites absent, third carinate at middle; apical abdominal 

 segments differing in the two sexes ; tarsi five-segmented ; tibiae not 

 greatly expanded and bearing at most a few small spinules. 



Re7n/7rks. — Like other genera in this tribe, this genus does not differ 

 from Holotrochus in striking structural characters. It is, however, at 

 least as valid as Holotrochus and has a rather distinct facies. 



It seems to me that Neotrochus is insufficiently separated from 

 Osoriiis and will, if additional characters are not found to dis- 



