Feb., '02] ENTOMOLOGICAL NEWS. 49 



the same dusky color on the anteclypeus. Prothorax largely yellowish. 

 United mid-dorsal thoracic stripes wider than in fraternus, widening be- 

 low, as in vastus, to a greater or less extent, so that the pale area between 

 the antehumeraland median stripes is greatly reduced, as compared with 

 fraternus ; humeral and antehumeral distinct, rarely fused for a short 

 distance above ; stripes of lateral sutures complete, the area between 

 more or less obscured. Femora reddish brown, paler below ; second 

 tarsal joint yellowish dorsally, most distinct and sometimes evident only 

 on last tarsi, rarely obscured throughout. Abdominal segments two to 

 six black, marked with yellow and green. Accessory genitalia of male 

 pale brown ; the hook of the second hamule, bounded apically and bas- 

 ally by a small black tooth, shorter and weaker than in fraternus and 

 crassus. 



Referring again to the items in the description above, num- 

 bered (i) to (12), hybridus is separated ixova. fraternus \iy (4), 

 (7). (8), (9), (10) and (12) ; from extermishy (i), (2), (3), 

 (4), (6) and (7) ; from crassus by (2), (4), (5), (8), (9), 

 (10), (11) and (12). Or fraternus and hybridus are alike, 

 with possible slight differences, in (i), (2), (3), (5)', (6) and 



(11) ; externiis and hybridus in (5), (8), (9), (10), (11) and 



(12) ; crassus and hybridus in (i), (3), (6) and (7). Hybri- 

 dus differs most widely from crassus ; the male is voxy closely 

 related to fraternus, while the female has more resemblances 

 to externus — a condition which justifies the specific name 

 proposed. 



Described from 32 specimens — 15 $ and 179: 



Cumberland River, Nashville, Tennessee, below the State 

 Penitentiary: May 12, igoi, i $\ May 15, 1901, i^, i 9; 

 May 19, 1901, I ^, I 9; May 22, 1901, i <? , 39; May 23, 

 1901, 6 <? , 5 9 ; May 30, 1901, i 9 ; June 2, 1901, i $ ; June 

 6, 1901 , I 9 ; June 7, 1901 ,2 ^ , 29. 



Cumberland River, above mouth of Stone River : May 16, 

 1901, 1^,39. 



Stone River, near Cumberland River: May 16, 1901, i $ . 



Unfortunatel}' much of this material is so teneral as to be of 

 little or no value, and for this reason dotibtless some variations 

 have been overlooked. Exuviae of the species were collected. 

 Specimens of these have been sent to Prof. Needham. The 

 types of the species are placed in the Museum of Compara- 

 tive Zoology, Cambridge, Mass. 



