DYNASTIN/E 135 



of an occasional very feeble sinuation of the clypeal apex. Mr. 

 Bates has already called attention to this in the Biologia. 



Group I. 



Subgenus Plagiosalia nov. 



The pronounced peculiarities in the structure of the anterior 

 tibiae, scutellum and female elytra would seem to afford ample 

 ground for subgeneric separation from the typical Cyclocephala, as 

 represented by signata and allied forms; in addition, there is much 

 greater difference between the male and female tarsi and the 

 system of coloration also does not agree. Besides complanata, 

 the subgenus will include the two following species: 



Form oblong, stout, rather convex, shining, glabrous, pale brownish-rufous 

 above and beneath, the legs concolorous; head gradually blackish 

 basally; elytra, in the least developed degree of ornamentation, 

 having a broad discal oblique vitta from the humeri nearly to the 

 apex and a narrow and perfectly even sutural vitta, both of piceous- 

 black, then the sutural vitta begins to broaden basally and a brown 

 side margin appears, the oblique and sutural vittae then broaden and, 

 in the majority of individuals, completely coalesce; finally the entire 

 elytra are black, excepting a broad sublateral streak, not attaining 

 base or apex, and an apical remnant of the space between the sutural 

 and oblique vittae; head small, closely but not coarsely punctato- 

 rugulose, abruptly sparsely punctate at base; clypeus nearly twice 

 as wide as long, a little less (c?), trapezoidal, with arcuate sides, 

 obtuse rounded angles and feebly arcuate, slightly reflexed and 

 somewhat thickened apex; suture obliterated medially; antennal 

 club small in both sexes; pronotum three-fifths (cf) to three-fourths 

 (9) wider than long, the sides rounded, converging anteriorly to 

 the very acute and prominent angles, the apical sinus deep; basal 

 angles broadly rounded; base with a very faint truncate median 

 lobe; ambient bead entire and black throughout the periphery; 

 punctures small and sparse, more distinct laterad; scutellum barely 

 as wide as long, acutely ogival, nearly smooth, pale, with infumate 

 margin even in the most feebly colored individuals; elytra about a 

 fifth or sixth wider than the prothorax, parallel, with feebly arcuate 

 sides and circularly rounded apex, the fine punctures serial except 

 suturad and laterad, finer laterad in the male than in the female; 

 pygidium (cf) strongly transverse, almost punctureless but finely 

 chagrined, or ( 9 ) less transverse, shining and with distinct punctures, 

 which become dense laterad; abdomen nearly smooth, with the usual 

 transverse lines of punctures, the last segment ( 9 ) with scattered 

 coarse punctures, wanting on the much shorter corresponding seg- 

 ment of the male; sterna with moderate pale pubescence. Length 

 (cT 9 ) 11.5-14.5 mm.; width 6.8-8.0 mm. Honduras (San Pedro 

 Sula). Twelve examples *obliquata n. sp. 



