. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BRUES AND MELANDER: CLASSIFICATION OF INSECTS 421 Presternum without such backwardly directed process (if rarely with such a process, it is not received in the mesosternum). 43 40. Prothorax loosely joined to the mesothorax, freely movable, its hind angles usually prolonged backward into teeth; prosternal spine loosely received in a notch in the mesosternum; front coxal cavities contained entirely in the presternum 41 Prothorax firmly attached, not movable; front coxal cavities closed behind by the mesosternum. (Drape
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BRUES AND MELANDER: CLASSIFICATION OF INSECTS 421 Presternum without such backwardly directed process (if rarely with such a process, it is not received in the mesosternum). 43 40. Prothorax loosely joined to the mesothorax, freely movable, its hind angles usually prolonged backward into teeth; prosternal spine loosely received in a notch in the mesosternum; front coxal cavities contained entirely in the presternum 41 Prothorax firmly attached, not movable; front coxal cavities closed behind by the mesosternum. (Drapetes, Throscus, cosmop.; Paradrapetes, Aulonothroscus, widespr.; Pactopus, nearc). (TRIXAGIDvE) THROSCIDtfl 825 yyXv. Figs. 822-826. Coleoptera 822. Macronychus, apical portion of tarsus. Helmidse. 823. Tenebrioides (Back and Cotton) Ostomatidse. 824. Chrysobothris (Chittenden) Buprestidse. 825. Scirtes (Grandi) Helodidse. 826. Melanotus (Hyslop) Elateridse. 41. Hind coxa? laminate; trochanter short 42 Hind coxa? not laminate; middle and hind trochanters very long; labrum short, transverse, connate with the clypeus; antenna? serrate (9 ) or pectinate (cf). (Cerophytum, holarc). CEROPHYTID5I 42. Labrum visible, free; antenna? arising near the eyes under the frontal margin; last two sternites connected by a membranous suture; presternum lobed in front; beetles capable of moving the prothorax by its basal joint with a sudden clicking motion. (If the middle coxa? are not distinctly separated, see couplet 76). Click-beetles, Wireworm beetles. (Lacon, Drasterius, Elater, Cardiophorus, cosmop.; Adelocera, Melanotus, Alaus, Monocrepidius, widespr.; Pyrophorus, Am., Austr.; Dichro-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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