A.MKinCAN DII'TERA. 5 



5.— liiiiil feiiiorii of nearly equal thickness throughout; antenna; with a distinct 



terminal style; very large, robust, thickly pilose species....IIy|>erecllia. 



Hind femora thickened toward the end; antennae without terminal style; 



more elongate, less pilose species Andreiiosoma. 



6. — Thorax and abdomen nearly or quite bare 7. 



Thorax and abdomen thickly pilose, larger species 8. 



7. — Hind femora with spinous tubercles below I^aiiipriM. 



Hind femora without spinous tubercles below ^laira. 



8. — Densely pilose species; the abdomen short, broad, usually broader beyond the 

 middle, in the male sometimes more elongate; proboscis thick.... Dasyllis. 

 Less pilose, more elongate species; proboscis more elongate an<l slender. 



Laphria. 



Bigot, Bulletin Soc. Ent. de France I 882, Xo. 9. p. 112. 



Ce7-n/ urgas O^teii Sacken (parte). 



ThLs pi'Dposed new genus of DasijpoyoniiHn^ has been iiit«ufficiently 

 characterized by its author, with a very brief diagnosi.s of the type 

 species as follows : 



"Myelaplms iiiela!<i %. — Long, la mm. Totns niger, abdomine nitido ; 

 halteribiis ct pulviUis flavis ; alia nigris, intus et apice parum dilutioribus. Oculis 

 nudis. — California." 



I have before me a specimen which I believe to be this, together with 

 two other species closely allied, and which appear to offer sufficient char- 

 acters to justify their separation from Ccraturyns^ under which one of 

 them had been described by Baron Osten Sacken. From the light that 

 these species afford on the value of the characters in this genus and Cera- 

 turgm it seems desirable to give the structural and specific characters in 

 detail. 



Head liroader than tlie thorax, considerably broader than high. Face a little 

 less than a third as wide as the head, its sides very nearly parallel", diverging but 

 very slightly below, bare, smooth and shining, on the oral margin in front with a 

 thin row of moderately long bristles; in profile gently receding, above the middle 

 with a moderately large obtuse tubercle (wanting in M. lobicornis), not reaching 

 quite as far forward as the base of the antennae, between which it is gently con- 

 cave, and below the tubercle to the oral' margin considerably receding, nearly 

 straight; the oral margin in front is distinctly above the lower borders of the 

 eyes, so that the lateral margins of the mouth are considerably oblique, and 

 straight. Antennae situated upon a large obtuse tubercle, about as long as the 

 dorsum of the thorax, composed of five joints as in Ceralurgu.i, all of which are 

 distinctly separated from each other: first joint cylindrical, elongate, rather more 

 than three times as long as the second; second joint short, but little longer than 

 broad ; third joint distinctly longer than the first two together, somewhat com- 

 })ressed, only a little broader, terminating in two lateral lobes, or processes, which 

 extend as far as the insertion of the second joint of the style ; fourth joint, or first 

 joint of the style, somewhat Y shaped, the terminal lobes being rather more than 

 one-half of the entire length of the joint, longer and more slender than those of 



(2) 



