Science Bulletin Volume 5, No. 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...flat, thin, rectangular, and boxlike, the open side of the box being the caudal side (28-1), against and into which opening fit the anterior part of the prosternum, the procoxae and the mouth parts. The following parts and regions of the head, excluding the frons and clypeus, which will be described under "mouth parts," are to be found: epicranium, genae, frontal cones, antennal sockets, compound eyes, and ocelli. The epicranium forms the front wall of the head and is vertical in position. Its posterior margin is slightly concave, and curves caudad and ventrad to the opposite side of the head, forming a roll-like edge. This roll-like portion is the dorsal part of the head when the latter is in normal position. This region of the head (28-4, ep) is rectangular, about 0.45 mm. wide and 0.62 mm. long. Its posterior edge is concave, as are also the lateral edges which border on the compound eyes, while the anterior margin is quite convex and has a somewhat more than semicircular excision at its median point, in which region is located the frontal ocellus, seen in figures 4 and 5, fo, and in 2 in longitudinal section, pi. 28. The epicranium is seen to be flat in surface when the head is viewed in profile. The other two ocelli (28-4, o) are placed at the two posterior angles of the epicranium, near its margin and slightly posterior to the compound eyes. They are about 0.07 mm. in diameter. The epicranium is divided along its median line by a very plainly cut suture into two equal sclerites. This suture is deep, and in making dissections of the head these two sclerites were often separated readily along this line. The anterior, convex suture between the epicranium and the rest of the head was not so apparent in most specimens that I examined, though usua...