THYCE AND POLYPHYLLA 341 



a third longer than wide, much wider than the prothorax, the surface 

 nearly smooth, only very faintly rugulose, the intervals finely and 

 sparsely punctate, with the scales small, slender and yellow, the 

 dense scales of the suture and four discal lines whiter; pygidium 

 relatively rather small, triangular, clothed more or less sparsely 

 throughout with pale yellowish scales; abdomen black, with nu- 

 merous erect hairs and with small sparse scales, which are sometimes, 

 but apparently not always, denser at the segmental apices; middle 

 tarsi much shorter than the tibiae. Length 32.5-34.0 mm.; width 

 15.5-16.5 mm. Mexico (Guadalajara). Two examples. [Mel. 

 leitcogramma Chev.] *petiti Guer. 



Antennal club not so greatly developed, never so long as the head and 

 prothorax combined 24 



24 Antennal club ( 9 ) unusually developed, nearly as long as the entire 

 stem. Body (9) very large in size, broad, oblong-oval, convex, 

 rather shining, castaneous in color throughout; vertex and clypeus 

 coarsely and closely punctured, with many coarse, posteriorly re- 

 clining hairs and with coarse scales near the eyes; clypeus flat, 

 gradually reflexed laterally, abruptly and moderately at the apical 

 margin, the apex broadly bisinuate, the angles prominent and sub- 

 acute, the parallel sides arcuate, the surface sparsely hairy, with a 

 few intermingled scales, the latter smaller and closer apically; last 

 palpal joint slender, much narrower than the preceding; prothorax 

 large, rather more than twice as wide as long, the sides broadly, 

 obtusely angulate just behind the middle, the base broadly and 

 arcuately lobed; punctures rather coarse, irregular in distribution 

 but in general rather widely separated, each with a broad elongate 

 yellow scale, gradually becoming very small at the sides; at the 

 middle of the apex there are some moderate erect hairs; median and 

 broadly, anteriorly interrupted, sublateral vittae of dense white scales 

 well developed; scutellum broadly and densely squamose along the 

 middle; elytra large, two-fifths longer than wide, a third wider than 

 the prothorax, rounding apically behind the middle; surface rather 

 smooth, only faintly rugulose, sparsely punctate and with sparse 

 yellow scales, which are less than three times as long as wide; suture 

 and four discal vittae of dense scales white, the first discal somewhat 

 irregular before the middle, the third fine and comminuted, short; 

 pygidium about as long as wide, feebly convex, triangular, with large 

 sparse lanceolate scales and rather long sparse erect hairs, the scales 

 becoming narrower and dense near the basal margin; abdomen black, 

 rufous apically, sparsely squamose, closely so toward the segmental 

 apices. Length 36.0 mm.; width 17.8 mm.; length of antennal club 

 2.9 mm. One specimen, the type of the species. 



Male nearly as large but not quite so stout as the female, similar 

 in coloration and vestiture throughout, the clypeus a little longer, 

 with denser scales, more truncate at apex, the angles right and blunt, 

 the sides arcuate, more converging basally; antennae brown, the 

 club fully four times as long as the stem; prothorax similar but 

 shorter, more than twice as wide as long; scutellum and elytra nearly 

 as in the female, except that the dense whitish lines are narrower; 



