Coleoptera. 37 



71. Front coxae globose '^^ 



Front coxfe oval ^^ 



72. Tarsi slender, third joint distinct, but shorter than the second; very small 



species. (Rhymbus, Rhanis) (PI. 7, fig. 142) MYCET^ID^ 



Tarsi more or less dilated and spongy beneath; elongate beetles with hard body 

 and strongly clubbed antenna;. (Lang^ria, Tritoma, Erotylus.) 



EROTYLID^ 



73. Front coxce almost in contact, prosternum more or less membranous, not 



visible between them. (Georyssus.) GEORYSSID.^ 



Front coxae well separated by the horny prosternum 74 



74. Head more or less concealed by the projecting prothorax; body cylindrical. 



(Cis, Ennearthron.) CIOID^ 



Head free, not covered by the prothorax; body oval, depressed, pubescent. 

 (Mycetophagus, Litargus.) MYCETOPHAGID^ 



75. Antennte thickened, or with a two-jointed club; tibiae simple, not dilated nor 



spinose. (Ditoma, Cerylon, Philothermus.) COLYDIIDjE 



Antennae with a large serrate, seven-jointed club; front and middle tibiae 

 dilated and armed with rows of spines. (Heterocerus) (PI. 7, fig.144). 



HETEROCERrD.^ 



76. Tarsi three-jointed '^7 



Tarsi with less than three joints 85 



77. Wings fringed with long hairs 78 



Wings not fringed 80 



78. Abdomen with only three ventral segments; very small, rare beetles occurring 



beneath stones in the Pacific region. (Sphaerius.) SPH^ERIIDiE 



Abdomen with six or seven ventral segments 79 



79. Antennae slender, nine- to eleven-jointed, with whorls of long hairs; very 



minute, shining beetles found on foliage. (Nossidium, Trichopteryx, 



Nephanes.) {TRICHOPTERYGIDM.) PTILIID^ 



Antennae short, eight-jointed, thickened apically; a rare aquatic beetle from 

 California. (Hydroscapha.) HYDROSCAPHID^ 



80. Second joint of tarsi dilated; the third joint consisting really of two joints, the 



small, true third joint being fused with the base of the last joint, which thus 



appears as the third 81 



Second tarsal joint not dilated . .82 



81. Tarsal claws dilated or toothed at the base; first ventral segment with curved 



coxal lines; small, rounded, convex, usually brightly spotted beetles. 

 "Lady-birds" (Coccinella, Hippodamia, Adalia, Megilla, Anatis, Epilachna) 



(PI. 6, figs. 118, 120, 121, 123) COCCINELLID.^ 



Tarsal claws simple, first ventral segment without coxal lines; small, oblong 

 or oval beetles, often with a striking color pattern. (Endomychus, Lyco- 

 perdina, Aphorista.) ENDOMYCHID^ 



82. Elytra entire 83 



Elytra truncate, exposing the last abdominal segment 84 



