74 Trans. Acad. Sci. of St. Louis. 



prothorax elongate-oval, the angles obliterated; abdominal segments 

 strongly, transversely impressed at base ; legs and tarsi rather slender. 

 Pacific coast of America Latkrotropis 



18 — Body somewhat small in size, more or less slender and less convex, 

 parallel, the head oval or subquadrate, with the basal angles more or 

 less rounded; eyes rather small in size, anterior; labrum short, the 

 lobes widely divergent, more narrowly rounded laterally ; maxillary 

 palpi slender and elongate, not inflated; antennae more or less slender 

 and elongate, the joints obconical; neck always noticeably less than 

 half as wide as the head; prosternum rather long before the coxae, fre- 

 quently feebly carinate throughout the length; prothorax more or less 

 narrow and elongate-oval, with the anterior angles broadly rounded or 

 obliterated, the punctures generally dense and confused, with the 

 median impunctate line frequently subelevated; elytra frequently 

 longer and wider than the prothorax, the punctures generally feebly 

 sublineate; legs rather long and slender; tarsi as in the preceding 

 genera. Europe and America Lobrathinm 



Body larger in size and less punctate ; posterior tarsi rather shorter but more 

 or less slender, the first joint subequal to the second and each longer 

 than either the third or fourth, the fifth subequal in length to the first 

 two together; body moderately large in size, rather broad, moderately 

 convex, the head generally distinctly narrower than the elytra, broadly 

 arcuato-truncate at base, the angles rather distinct and more or less 

 narrowly rounded; eyes well developed; labrum with a large triangular 

 notch, the lobes obliquely subquadrate, each sub rectilinear at apex; 

 maxillary palpi more or less elongate, not inflated, the fourth joint con- 

 ical and acutely pointed ; neck broad, more than half as wide as the 

 head; antennae rather long and slender as a rule, filiform; prosternum 

 short before the coxae; prothorax more or less oblong or obtrapezoidal, 

 moderately elongate, with the anterior angles distinct ; elytra larger than 

 the prothorax, with the punctures generally sparse and always lineate 

 in arrangement; legs rather long and slender. America... Lathrotaxis 



19 — First and second joints of the hind tarsi equal or with the first a little 

 longer than the second 20 



First joint of the hind tarsi much shorter than the second 22 



20 — Hind tarsi shorter, the four basal joints short and subequal, the fifth 



moderate; anterior tarsi feely dilated. Body very small, slender, rather 

 depressed, the head small, broadly arcuato-truncate at base, the labral 

 lobes thick, subquadrate, with rounded angles; eyes rather small; max- 

 illary palpi short and stout, the third joint somewhat inflated; gular 

 sutures very widely separated and strongly divergent, being separated 

 at base by about a third the width of the head; antennae rather long 

 and thick, the joints obconic; neck half as wide at the head; proster- 

 num short; prothorax short, oblong, the angles acutely defined, the 

 median impunctate area defined by impressed lines; elytra well devel- 

 oped as a rule, longer and wider than the prothorax; abdomen gene- 

 rally opaque and very densely punctulate. Eastern America. 



Psendolathra 

 Hind tarsi long, the two basal joints more elongate 21 



21 — Hind tarsi stout toward base, the fifth joint much elongated, the an- 



