17b' AMERICAN COLEOPTERA 



margin. The last joint of the front tarsi is not toothed beneath in the % . In 

 this same sex I have noticed another singular character. The fifth (apparently | 

 ventral segment is produced iu a rounded lobe, which is polished, im punctate and 

 closely fimbriate along the margin. The fifth and six ventrals are so closely 

 united in the specimens before me, that the suture is difficult to make out. and I 

 do not feel certain as to which the above structure pertains. A somewhat similar 

 but less developed structure I think I have observed in males of pumila, hut not 

 elsewhere. It is, perhaps, significant that in these two species the front tarsi lack 

 the tooth with which the claw joint is armed in the males of allied species. 

 Length 1.2-1.4 mm. 



Huh. — Florida — many localities in the southern half of the 

 peninsula and in the Keys. Collected by Hubbard, Schwarz 



and Wickhain. 



M. gibbosa Herbst. — Oval, convex, usually piceous brown, but sometimes 

 paler, antennae and legs paler: pubescence moderate in length, rather closely re- 

 cumbent. Head not very coarsely, but strongly and closely punctate, eyes 

 moderately large and prominent, tempora subobsolete. Antennae about reaching 

 the hind angles of the prothorax ; joints all longer than wide, except the tenth, 

 which is as wide as long. Prothorax slightly wider than the head, and scarcely 

 exceeding half the width of the elytra, very little wider than long; sides rounded 

 a little anteriorly, thence feebly convergent and nearly straight to the hind 

 angles, which are a little obtuse and not marked by a prominent denticle; mar- 

 gin scarcely, or very slightly crenulate; surface closely punctate and with an 

 arcuate suhbasal impression, which is usually moderately deep and reaches from 

 side to side. Elytra oval, rather strongly punctate-striate, intervals somewhat 

 more finely serially punctate. Presternum punctate, especially along the front 

 margin ; metasternum as strongly but less closely punctate at sides, more remotely 

 at middle, median line impressed in apical half; abdomen more finely and 

 sparsely punctate. Middle coxae separated by about two-thirds the apical width; 

 hind co\;e widely separated, the intercoxal process truncate. Legs moderate. 

 (PI. V, fig. 66). 



Mate.— Anterior tibiae a little arcuate, and armed on their postero-interior face 

 with an acute tooth, which is situated at about the apical fourth ; front trochan- 

 ters finely denticulate; first joint of front tarsi a little dilated ; sixth abdominal 

 segment usually plainly visible, the fifth shorter and more truncate than in the 

 female. 



Female. — Tibiae, tarsi and trochanters unmodified ; sixth abdominal segment 

 rarely at all visible, the fifth nearly as long as the two preceding together, and 

 more narrowly rounded at the apex. 



Length 1.1-1.5 mm. 



ILih. — New Hampshire; Massachusetts; Michigan; West Vir- 

 ginia; British Columbia; Washington; Oregon; So. California. 



A cosmopolitan species, which does not, however, as yet appear 

 to have become established in the southern portions of our territory, 

 except on the Pacific Coast. The densely punctate head, narrow 

 subparallel thorax and sexual characters make its recognition ex- 

 ceptionally easy. 



