Some Hypermetamorphic Beetles 15 



Xenos pulvinipes, n. sp. 1 



Male. — Length 2 mm. ; color, very dark brown with light 

 yellowish legs. 



Antennae four-jointed; first and second joints externally 

 obliquely truncate, emarginate, for the reception of the following 

 joint, very short; third joint with stem as short as preceding 

 joints but elongated anteriorly into a very long, ribbon-like la- 

 mella which twists around the fourth joint; fourth joint sur- 

 passing third by length of stem of first three; third and fourth 

 joints very slightly inflated, thickly covered with very fine hairs 

 and very closely provided with large sensory pores. Eyes globu- 

 lar; lenses few, large, and separated by slightly raised, densely 

 pubescent partitions. 



The mouth-parts of Stylopidae are not well understood, and 

 the author is not able to give a perfect description because of 

 the fact that the type is mounted with the head turned partially 

 sideways and also because of the difficulty of viewing the object 

 with a high power and obstructed light. Three distinct pairs of 

 mouth appendages are, however, visible. The first is a trans- 

 parent yellow lancet-shaped appendage, curved slightly at the 

 base, toothed near tip, obliquely truncate and acute at tip. This 

 the author regards as the mandible, but as there is no proof as 

 to its point of attachment, nothing definite can be said. The next 

 pair seem to be the maxillae or maxillary palpi. They are three- 

 jointed, the first and second joints about equal and moderately 

 long, the third very long and broadly flattened. The third pair 

 appear to be merely single- jointed appendages (the base, how- 

 ever, is obscured), and are nearly as long as the third joint of 

 the maxillary palpi. This is probably the labial palpus. 



The prothorax is a mere band. The mesothorax is about dou- 

 ble the length of the prothorax. The metathorax is composed 

 of the typical parts named by Westwood. Following Westwood's 

 nomenclature, the lumbi of the scutum do not meet in the center 

 and are somewhat elevated, with the interior margin rounded; 

 the praescutum and scutellum are distinctly separated, but to- 

 gether resemble a spindle; the postlumbium is shield-shaped, 



1 See pi. I, fig. 1. 



167 



