10 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol. 65. 



Linnaeus and ohscurus Fabricius. This is largely due to differences 

 in structures exhibited by the larvae. These can be briefly summa- 

 rized as follows : Setae on the dorsal side of the back of mandible are 

 scattered and numerous, instead of grouped with one seta anteriorly 

 and two setae posteriorly as in the two latter forms mentioned above; 

 and pygidium is apically acute, without cerci and with many short, 

 spinelike setae along the lateral margins, instead of bicornute and 

 with only two spinelike setae along each margin near cerci. 



LeConte in his Classification of the Coleoptera of North America,^ 

 founded a new genus Neatus^ based on tenebriodes Beauvois. Later 

 this species was identified with the European TenebAo picipes 

 Herbst. His genus was unfortunately lost sight of for many years. 



From the standpoint of larval characters it should be recognized 

 either as a good genus or a marked subgenus. Seidlitz, in Erickson's 

 Naturgeschichte der Insecten Deutschland,^ gives a concise key to 

 the larvae of Teiiebrio which is here translated and slightly changed 

 to properly set off Meatus LeConte as a distinct genus. 



1. The last dorsal segment terminating in two hook-shaped points, on the sides 



of which there are at most two small spines 2. 



The last dorsal segment terminating only in one point, near which on either 

 side, are numerous small spines Neatus picipes Herbst. 



2. The two points of the last dorsal segment distinctly bent upward 3. 



The two points on the last dorsal segment almost horizontal 



Tenebrio opacus Duftschmid. 



3. The last dorsal segment shorter than its width at the base; the two points 



are little divergent ; the upper side light yellow 



Tenebrio molitor Linnaeus. 

 The last dorsal segment as long as its width at the base ; the two points are 

 more strongly divergent ; the upper side is dark brown 



Tenebrio obscums Fabricius. 



Later Mr. Edmund Reitter, in his Fauna Germanica ^ treats Neatus 

 as a subgenus of Tenehrio without giving any characters. 



The genera previously described in this paper can be separated by 

 the following characters: 



KEY TO THE GENERA OF TENEBRIONINAE. 



Back of mandible opposite molar part with membranous elevation (S, figs. 

 60, 61, 62) 1. 



Back of mandible opposite molar part without membranous elevation (figs. 

 2, 5, and 32) 2. 



1. Back of mandible opposite cutting edge with margin sharp (c, figs. 60 and 

 61) ; near condyle for ventral articulation of mandible, two strong setae 



(Lower«California and Arizona) Rhinandrus LeConte. 



Back of mandible opposite cutting edge with margin round (fig. 62) ; near 

 condyle for ventral articulation of mandible, one strong seta (Central 

 and South America and Florida) Zophobas Blanchartl. 



7 Part 1, 18G1, p. 233. « Vol. 5, 1896, pp. 628-630. » Vol. 3. 1911. p. 347. 



