94 KANSAS UNIVERSITY SCIENCE BULLETIN. 



muscles, and there are numerous muscles running longitudi- 

 nally, which are not shown at figure 50, but may be seen in 

 cross sections in figures 46 and 45 at m, m, plate XIII. 



Running along the exterior surface of the floor and down the 

 dorsal side of the beak is the chitinous rod used as a brace. 



Thorax. The head is fastened to the prothorax by two 

 muscles (m-m, fig. 40, pi. XII). It is fastened to the meso- 

 thorax by a pair of lateral muscles. The union with the meso- 

 thorax is completely covered by the prothorax with its lateral 

 arms, back of the compound eyes. 



Shape. — The prothorax may be seen in figure 61, plate XVI. 

 It is compressed and the metopidium rises into a compressed 

 and greatly elevated procephalon, which in lateral view is 

 "spade-shaped." The dorsum is deeply sinuated at about one- 

 third the way toward the posterior end. This sinuation forms 

 the back of the procephalon and also the front edge of the dor- 

 sal hump. The color of the prothorax is a dull tan and brown, 

 varying in the sex. The color markings differ in some re- 

 spects, but this is fully discussed under the head of Entylia 

 sinuata, in the systematic paper at the close of this treatise. 

 The mesothorax and metathorax are shown in dorsal aspect at 

 figure 1, plate V. Here the bullse, or lobes, are to be seen; also 

 the articulation of the tegmina and wings with the body. In 

 each section (meso or meta) the scutum or bullse are elevated 

 and polished; much enlarged in comparison with the other 

 segments, as they contain muscles used in flying. The prse- 

 scutum, scutum, scutellum and postscutellum are marked and 

 indicated on figure 1. 



Tegmina. 



The tegmina of Entylia sinuata, like all of the genera of the 

 tribe Polyglytini, are punctate and darkly coriaceous in the 

 costal, radial and first basal cells. In Entylia sinuata the 

 punctating is dense and heavy, as is shown in figure 1, plate V, 

 and figure 83, plate XX. 



The veins in the tegmen seem to be pushed anteriorly, leaA'- 

 ing a wide, unveined area below the first ulnar vein. The 

 second ulnar vein disappears soon after leaving the base, but 

 reappears near the posterior margin, where it appears in a 

 hook-shaped line curving into the anal vein of the clavus. 

 (Fig. 64, pi. XVII.) 



