BRANCH: BIOLOGY OF KANSAS MEMBRACID^. 77 



The head is usually perpendicular, and when viewed from 

 the front appears somewhat triangular, with large globular 

 eyes protruding on either side. On the face or cephalic aspect 

 of the head and between the compound eyes are situated the 

 two small ocelli. 



In all genera the prothorax is abnormal, being produced up- 

 ward and backward or forward into numerous shapes. In the 

 Kansas forms, at least, it extends well back over the abdomen, 

 concealing the mesothorax and metathorax, and frequently 

 continuing as far back as the tips of the tegmina. It rises 

 from the head in a perpendicular line, and is as wide as the 

 head, extending back of the compound eyes and under the 

 mesothorax for a short distance, by means of small lateral 

 arms. (See fig. 34, pi. X.) Frequently the prothoracic legs 

 are removed with the prothorax, as they are connected to the 

 lateral arms by a delicate membrane. Back of the compound 

 eyes the prothoracic lateral margin rises and turns caudad 

 suddenly under the suprahumerals, thus forming the lateral 

 angles, or humeri. (See fig. 7, pi. VI.) Fastened into this 

 angle is a tiny sclerite, which seems to help in the protection 

 of the tegmina. 



In the prothorax there are four main divisions, the meto- 

 pidium, procephalon, dorsum, and posterior process, although 

 there are no definite sutures to mark the divisions. 



Metopidium is the sloping portion of the front of the pro- 

 thorax extending from the head to the front of the doi'sum, 

 and bearing the suprahumeral processes (fig. 5, a, pi. VI). It 

 may extend in a horn over the head as in Campijlenchia cw- 

 vata (fig. 11, pi. VII), or it may be void of any protuberance 

 on the top. The suprahumeral processes are the lateral pro- 

 tuberances seen at the sides over the compound eyes and 

 humeri (fig. 5, e; fig. 7, x, pi. VI). These suprahumerals are 

 variable in shape, and are sometimes so obscure as to appear 

 absent until the hand lens is used. The procephalon is the 

 portion above the metopidium. In the exotic forms it may 

 extend backward as a horn and be branched into several spines, 

 but among the Kansas species this form is not found. The 

 procephalon is not present in our forms except in the two 

 genera Enchcnopa and Campylenchia (figs. 11, 12, pi. VII). 

 The dorsum is the portion from the suprahumerals to the 

 tail. It is convex in the Kansas forms and without any 



