Sept. 1896.] 
Wickham : Larwe of Some Beetles. 
121 
These larvae are found occasionally about rotten wood near Iowa 
City and are remarkable for the shape of the last abdominal segment. 
The change to pupa takes place in April, one of mine pupating on the 
twenty-second of the month, the beetle appearing on May fourth. The 
pupa is white, lying naturally in a curved position. Length, measured 
along the chord of the arc, 14 mm. The sides of the abdominal seg¬ 
ments are armed with flattened processes, bearing each a short spine at 
tip; these processes are two in number on each side of the second, third, 
fourth and fifth segments; on the first segment there is but one, a short 
one, while the single one on the sixth is of moderate size. The last 
segment is excavated above and armed with a pair of long sharp termi¬ 
nal spines. 
Hymenorus obscurus Say. (Fig. 3.) 
Larva very elongate, slender, subcylindrical; back very convex, 
venter flattened, and with a longitudinal furrow on each side. Color, in 
life nearly white, in spirits yellowish, surface shining. Length, 12 to 
13 mm. Head about as wide as the prothorax and of darker color 
than the rest of the body, antennae four-jointed, first and second joints 
about equal in length, the first broader ; third joint about one and one- 
half times as long as the second, rounded at tip, a ring of small spines 
surrounding the subterminal enlargement; fourth joint small, papilli¬ 
form, trisetose at tip. Labrum more than twice as broad as long, sides 
rounded, apex truncate or very slightly emarginate, margin bristly, a 
few scattering spines on the surface, under face with a parabolic band 
of small spines (See Fig. 3 lbr.). Mandibles very heavy, deeply emar¬ 
ginate, strongly toothed, and with a broad basal molar portion. Max¬ 
illae with two rows of very strong spines on the inner face, as well as 
numerous scattered ones. Palpal joints decreasing gradually in thick¬ 
ness, apparently four in number, as shown in Fig. 3 max. ; there is, 
however, some slight damage done to the basal portion in my prepara¬ 
tion, so that I do not feel quite sure. The last joint has a fringe of 
small spines around the tip. Labium of moderate size, palpi thick, 
second joint narrower; the prolongation of the tip of the ligula is of 
considerable size, nearly reaching to end of first palpal joints, and bears 
at apex two bristles about equalling it in length. The chitinous sup¬ 
ports are two—the basal piece about as broad as long, rounded at base, 
rather deeply emarginate and distinctly sinuate at tip, angles prom¬ 
inent ; the apical piece elongate, narrow and deeply notched at tip. 
Prothorax longer than the mesothorax and metathorax, which are about 
equal to each other in length. The mesothorax bears a spiracle on 
