282 MR. G. BBOOK's revision 01^ THE 



long. Posterior end of body with rather stout clavate hairs, 

 with a few long bowed hairs scattered among them. Elater with 

 several long hairs at the end, one longer and larger than the 

 other and reaching a little beyond the end of the third joint ; the 

 second joint is serrulate along lower edge, it suddenly narrows 

 a little below the end and is a little curved ; third joint about 

 three times as long as wide, ending in a large hook, with a much 

 smaller supplementary tooth. Long -05- OQ in." 

 Under bark of trees. Hab. North America. 



12. Entomobrta purpitrascens, Pack. 



1873. Degeeria purpurascens. Pack. Thys. Essex Co., Mass. p, 39 ; 

 Guide to Study of Insects, pi. 10. f. 4 & 5. 



" Eyes black, with no connecting-lines. This is rather a large 

 species, with unusually long slender antennae ; with the body, legs, 

 and antennae of a purplish lead-colour, the purplish tint especially 

 noticeable on the two basal joints of the antennae. Not very 

 hairy ; the hairs on the prothorax and head of quite uniform 

 length, club-shaped, those on the posterior end of the body 

 very slender, no bowed ones amongst them (though my speci- 

 mens are somewhat rubbed). Legs slender, claws long and 

 slender, larger claw with two acute prominent teeth along the 

 inner edge. Elater with long dense hairs along upper side of 

 second joint; serrulate, the teeth suddenly ending, leaving the 

 end narrow, slender, naked, slightly bent, with a long hair pro- 

 jecting beyond the tip of third joint ; this joint rather short, 

 much curved on the outer side, ending in a rather slender hook, 

 with an inner one of nearly the same size. ' Catch ' large ; basal 

 joint longer than broad, with a stout bristle arising from middle 

 of anterior edge and reaching nearly to tip of second joint, both 

 front and bind edge with three or four notches ; second joint very 

 slender on the toothed portion, four-toothed, whole joint one 

 half as long as first joint. Length "OS-'OO in. Under boards 

 and bark of trees." Sab. North America. 



This description is taken from the ' Thysanura of Essex County, 

 Mass.' 



Packard also describes another species, D. decemfasciata, in the 

 above list. This species is figured in ' Study of Insects,' 3rd ed. 

 pi. 10. f. 2,3, under the name -D.^ayop2c^« (changed to flavocincta 

 in the latest editions). I have considered it so near to our mitlii- 

 fasciata that I have included both names as synonyms. Packard 

 also remarks that his species is very variable. 



