6 CARABID^E. DEMETRIAS. 



1. D. imp eri alls : pallida, capite pectoreque nigro-piceis, thorace 



rufo ferrugineo, postice angustato, elytris obsolete striatis, 

 suturd fused in medio dilatatd cum macula marginali 

 posteriore ramo arcuato obliquo connexd. 



Dromius imperialis, Germ. Spec. Nov. 1.1. 

 Demetrias imperialis, Sturm, D. F. 7. 63. Dej. Spec. 1. 229 ; 

 Icon. 1. 101. pi. 14. Steph. Mand. 1. 176, et Manual, p. 6. 

 Lebia atricapilla, var. c, Gyll. Ins. Suec. 2. 188. 

 Aetophorus imperialis, Redt. Faun. Aust. 75. 



Elongate, depressed, pale testaceous. Head black, large, 

 narrowed before and behind. Thorax rusty red, elongate heart- 

 shaped, much contracted behind. Elytra shorter and wider 

 than in the two following species, shoulders rounded, sides slightly 

 sinuated before the middle, then dilated till just before the tip, 

 much depressed, striated, the striae indistinctly punctured, and 

 with four deeper impressions, pale testaceous and transparent so 

 as to show the wings beneath, the suture fuscous till just before 

 the middle, when the dark colour dilates and forms a lozenge- 

 shaped spot, and on each side near the extremity of the outer 

 margin is another spot of the same colour, sometimes connected 

 with the former by an oblique line ; legs red. Length 2^ lines. 



To receive this insect a new genus (Aetophorus) has been 

 created by Dr. Schmidt (Stettin Ent. Zeit. 1848, p. 388). 



This species appears to have become very scarce in England, 

 though formerly it was far from uncommon in the fens of Cam- 

 bridgeshire and Huntingdonshire. 



2. D. atricapilla : pallida, capite nigro, thorace rufo, elytris 



obsolete striatis, immaculatis. 



Carabus atricapillus, Linn. S. N. 2. 673. 

 Lebia atricapilla, Gyll. Ins. Suec. 2. 188. 

 Demetrias atricapillus, Dej. Spec. 1. 231. Steph. Mand. 1. 



15, et Manual, p. 6. Erichson, Kafer, 28. Heer, Faun. 



Helv. 8. 



D. elonaatulus, Dej. Spec. 1. 232; Icon. 1. 104. pi. 14. 

 D. obscurus, (Newman) Steph. Mand. 5. 366. 



Linear-elongate, pale testaceous. Head black, crown smooth 

 and shining, with the sides punctured; mandibles, palpi and 

 antennae red. Thorax red, heart-shaped, posterior angles rather 

 acutely prominent, base with two fovese. Elytra oblong, shoulders 

 rounded, sides nearly straight or very little wider behind, the 

 apex truncate, obsoletely striated, some of the interstices at the 

 base and next the suture with distinct punctures; legs pale 

 testaceous. Length 2 lines. 



Generally distributed. 



