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 Description of the Larva of Thymalus fulgidus Er. 



BY WM. BEUTENMUELLER. 



Color: body above and below sordid white. Head light brown, 

 mandibles and cervical shield piceous, as is also the anal process. 



Head subglobose, shining, smooth ; anterior portion somewhat 

 narrower than the posterior. Eyes five on each side, minute. Cly- 

 petis transverse, much broader than long, sides somewhat oblique. 

 Labruin about one-third the size of the clypeus, anterior margin 

 rounded. Mandibles short, stout, apex obtusely bifid. Antennce 

 very short, 4-jointed, first and second joints thick, third joint shorter, 

 last joint slender, more elongate, with a short process at the base. 



Maxillce elongated, lobe rounded at the apex, with a few bristles. 

 Maxillary palpi 3-jointed, not extending beyond the lobe, first and 

 second joints same size, subglobose, third joint more slender. La- 

 bium quadrate, as broad as long. Labial palpi 3-jointed, all of 

 about equal width, subcylindrical, first joint stout, second joint more 

 slender, third joint rounded at the apex. 



^<9d/)' elongate, convex above, somewhat flattened beneath; pos- 

 terior extremity with a short fork-life process with a few small tu- 

 bercles. Thoracic feet short. The body, up to about the fourth 

 segment, is of equal width, then becoming somewhat broader, last 

 segment tapering; on the body above are three rows of depressed 

 spots and two rows beneath. 



Length about 6 mm. Width about 3 mm. 



Pupa sordid white, subfusiform, body tapering to a blunt point 

 at the posterior extremity, which is provided with two short tuber- 

 cles. Each segment laterally is furnished with a short tubercle, and 

 on the body above are three rows of small, elevated spots on each 

 side. Thorax smooth, shining, anterior margin truncate, with the 

 head bending downward. Antennae, wing-cases and legs free. 



Length 6 mm. Width 3 mm. 



Lives in numbers in a large species of white fungus growing on 

 trunks of prostrated white birch trees. The eggs are deposited late 

 in fall and emerge the following spring. The larva becomes full 

 grown in May. According to Chapius et Candeze (Mem. Soc. 

 Liege viii, p. 417, 1855) the larva of Thymalus limbatus of Europe, 

 is found under the bark of wild plum apparently living exclusively 

 upon the woody substance. 



