Sept., I9I1-] Wheeler : Notes ON Beetles OF Genus Xenodusa. 165 



men clinging to the lower surface of a stone covering a F. inccrta 

 nest at Forest Hills, Mass. This specimen, which is represented in 

 the accompanying figure, measures nearly 6 mm. in length and is 

 probably about one-half or two-thirds grown. Its milk-white body 

 is broad and flat in the middle but narrowed at the anterior and pos- 

 terior ends which are turned up. Eyes are absent. The antennae 

 and legs are well-developed, the last abdominal segment slender and 



Fig. I. Larva of Xenodusa cava Lee. 



of a peculiar shape. The vertex of the head is deeply and triangu- 

 larlv impressed in the middle. There are a few delicate, scattered 

 hairs on the legs, antenns, head, pronotum, venter and termuial 

 abdominal segments; on the remaining portions of the body the hairs 

 are very short, sparse and inconspicuous. 



Comparison of this larva with that of Lomechusa strumosa which 

 has been described by Wasmann^ and which I have taken in numbers 

 in F. sanguinea nests in the Alps, shows many striking differences. 

 The Lomechusa larva is more slender and cylindrical, its antenna 

 are reduced to mere papilte, its legs are very short and feeble, its 

 terminal abdominal segments are conical and the whole body is m- 



= Vergleichende Studien iiber Ameisen- und Termitengaste. Tijdschr. v. 

 Ent., XXXIII, 1890. pp. 27-96. I pl. 



