24 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



segment are apparent under magnification. They render the 

 anuuli conspicuous enough, in fact, to give an impression as of 

 false feet to the naked eye observing the larvae crawling. 



The mouth-parts are exceedingly minute and hard to ob- 

 serve. In arrangement they suggest those of the full-grown 

 larva (described below), and the homologies have been made 

 out accordingly, and. it is hoped successfully. The drawing 

 (fig. 1) is strictly diagrammatic and is made up from a num- 

 ber of studies of larval heads, none of which showed all the 

 parts in the position used in the drawing. 



Labrum (Ibr. ) short, pointed, black-tipped, and slightly curved down- 

 ward. Labiurri triangular, not bifid as in full-grown larva. Maxilla? 

 (mx.) fleshy, truncate-conical, with a short down- 

 wardly projecting lobe on inner side of distal end; 

 palpus (mx.p.) arising from end of maxilla, first 

 joint long, somewhat enlarged distally, tipped by 

 a number of short rods or spines, one of which is 

 larger and blunt. It may be considered a second 

 palpal joint surrounded at the base by a group of 

 spines. Mandibles (md. ) fleshy, blunt-tipped, 

 crenulate on lower edge, lying just inside of 

 maxillas. Antenna? (an.) straight, tapering, 

 directed forward; basal joint as long as first 

 palpal joint, somewhat expanded distally, second joint double, one of 

 its divisions longer and apparently tipped with a seta. 



First segment of body slightly inflated; first and second segments 

 convex above, flattened beneath, lower lateral edge rather prominent. 

 Second and third segments with two or three longitudinal furrows on 

 each side. Second segment with two conspicuous, well-separated, 

 elongate brownish spots visible (apparently somewhat under the sur- 

 face) on the dorsal aspect. Hind margins of segments becoming more 

 undulate posteriorly, markedly so on ninth and tenth segments. Last 

 segment with two round black spots (spiracles) set close together on 

 median dorsal surface; this segment with two more prominent ventral 

 tubercles, two similar lateral ones, and other minute tubercles. 



FULL-GROWN LARVA. 



The full-grown larva here described is one of two collected 

 by Theodore Pergande, near Cabin John Bridge, Maryland, 

 April 13, 1899. They were found under stones covering the 

 openings of mouse burrows. The color in life was gray. 

 The general color of the preserved specimen is dark brown; 

 the head is black. The total length, when the head is re- 

 tracted, is 17 mm., the greatest diameter 7.5 mm. With the 

 head fully drawn out the larva measures 21 mm. long. 



