64 BULLETIN 6G, UNITED STATES NATIONAL MUSEUM. 



In front of this there arises under the gena, at each side, a generally 

 two-jointed appendage. This can be no other than the maxilla, of 

 which the first joint is the palpiger and the second the palpus. This 

 is as held by Savigny (Newman, 1850). In Crawfordia pulvinipes 

 the maxilla is three jointed, the first two joints being somewhat 

 slender, and the third elongate and broadly flattened, paddle-shape. 

 In front of the maxillae arise the mandibles, slender, curved, scimitar- 

 like appendages, generally transparent, chitinous, but in Halicto- 

 phagidse membranaceous, villous, and very short. Beneath these 

 appendages is an integument which arises crater-like in front of the 

 crossed mandibles and forms the mouth opening. In the mind of 

 the writer all of this flared surface is the pharynx, which lies ex- 

 posed in the absence of labrum and labium and of broad append- 

 ages to cover it. It can hardly be called the labrum and labium 

 mortised together because the appendages arise above it and below 

 the gense. (See pi. 5, fig. 11; pi. 13, figs. 10, 13.) 



The thorax is by far the largest part of the body. The prothorax 

 is never more than a narrow ring sufficient to bear the legs, and yet 

 in Anthericomma harberi this part is resolved externally into a pro- 

 notal and prosternal disc around which the mesothorax has grown 

 and become contiguous with the head laterally. The prothorax is 

 connected with the head by an elastic band. It is composed of two 

 more or less distinct transverse dorsal pieces, a very narrow pleural 

 piece on each side and two ventral pieces feebly separated on the 

 median line. From the latter the legs arise with the cavities open 

 behind (Nassonow, 1892 c, pi. 2, figs. 2, 3, 4). (See pi. 14, fig. 5.) 



The mesothorax is likewise separated from the prothorax and 

 its component parts are more or less separated by elastic commis- 

 sures. Dorsally the chitinous part consists of a narrow transverse 

 band, a larger arched band inclosing posteriorly another curved 

 band. The pleural piece is somewhat oblique and bears the elytra. 

 These appendages are nothing more than bulbous clubs, sometimes 

 ladle-shaped. The mesosternum consists of a broad piece behind 

 which lies a spindle-shaped piece divided on the median line. The 

 legs are attached to the apical side of this with the coxal cavities 

 open behind. 



Below the elytra on the mesopleurae, or outer edges of the meso- 

 sternum, in species of the genus AcroscMsmus, a small but promi- 

 nent lobe arises which protrudes from the sides of the body, inclining 

 forward. This lobe is rather oblong, rounded, and in length about 

 equal to the breadth of the elytron at its base. The upper or dorsal 

 surface is convex, the ventral surface excavated and channelled 

 inward to an opening into the body. This opening the writer takes 

 to be the stigma, after consultation with Doctor Ashmead, Mr. 

 Schwarz, and Mr. Heidemann. The entire structure seems to be 



