128 GEO. H. HORN, M. D. 



EXPLANATION OF PLATE I. 



Fig. 1. — Trichopsenius depressus, (Lee.) 

 Fig. 2. — Trichopsenius depressus, underside. 



Fig. 3. — Anaci/ptus testaceus, {hec.) ; 3 a, underside; 3 6, antenna, elytral sculp- 

 ture magnified. 

 Fig. 4. — JL/pocyptus longtcornis, (Payk.); underside and antenna. 

 Fig. 5. — Tachiiius maculicollis, Miikl. ; a, last two veutrals % ; 6, dorsals % ; c, laat 



ventral 9 > (^> l<ist dorsal 9 • 

 Fig. 6. — T. semirufus, Horn, a, last two ventrals % ; b, last dorsal 9 • 

 Fig. 7. — T. memnonius, Grav., a, last two ventrals % ; b, last dorsal 9 • 

 Fig. 8. — T. tachi/poroides, Horn, a, last two ventrals %; b, last dorsal 9' 

 Fig. 9. — T. agilis, Horn, a, last two ventrals % ; b, last dorsal 9 • 

 Fig. 10. — T. angustatus, Horn, a, last two ventrals % ; b, last dorsal 9 • 

 Fig. 11. — T. debilis, Horn, a, last two ventrals % ; b, last dorsal % ; c, last ventral 



9 ; d, last dorsal 9 • 

 Fig. 12. — T. repandus, Horn, a, last two ventrals %; b, last dorsal 9- 

 Fig. 13. — T. scrutatw, Horn, last two ventrals % . 

 Fig. 14. — T. mimus, Horn, a, last two ventrals %; b, last ventral 9- 

 Fig. 15. — T. addendus, Horn, a, last two ventrals %; b, last ventral 9- 

 Fig. 16. — T. j)araUelus, Horn, a, last two ventrals % ; b, last dorsal 9 • 

 Fig. 17. — T. nigricornis, Mann., a, last two ventrals %,; b, last dorsal 9; c> J^st 



ventral 9 • 

 Fig. 18. — T. fimbriatus, Grav., a, last two ventrals %; b, last ventral %; c, last 



dorsal 9 • 

 Fig. 19. — T. picipes, Er., a, last dorsal % ; b, last dorsal 9 • 

 Fig. 20. — T. Schwarzi, Horn, a, last two ventrals %,; b, last dorsal 9 • 

 Fig. 21. — T. canadensis, Horn, last dorsal 9- 



Fig. 22. — T. limbatus, Mels., last dorsal 9 >and variations of middle lobe. 

 Fig. 23.— T.frigidus, Erichs., last dorsal 9- 

 Fig. 24. — T. Crotchii, Horn, last dorsal 9 • 

 Fig. 25. — T. instabilis, Miikl., last dorsal 9- 



Fig. 26.— T. circumcinctus, Makl., a, last ventral 9 > ^> '^st dorsal 9 • 

 Fig. 27. — Cilca silphoides, (Linn.), a, last two ventrals % ; b, last dorsal % ; c, last 



ventral 9- 

 Fig. 28. — Erchomus punctipennis, (Lee.), last two ventrals %. 

 Fig. 2'.>. — E. ventriculus, (Say), last two ventrals % . 



Fig. 30. — Mabrocerus Schwarzi, Horn, posterior coxae ; a, antenna (after Erichson). 

 Fig. 31. — Underside of head of Bolitobius niger, showing the margin beneath the 



eyes; a, antenna. 

 Fig. 32. — Head and thorax of Bolit. quctsitor. 

 Fig. 33. — Middle femur and tibia of Conosoma crassum. 

 Fig. 34. — Middle femur and tibia of C castaneum and others. 

 Fig. 35. — Maxillary j)al])i ; a, Bolitobius, (filiform); b, Bryoporus, (conical); 



c, Mi/cetoporus, (subulate) ; d, Ilabrocerus, (last joint long, slender 



and acute). 



