HEMIPTERA. 



201 



and membrane ; and the tarsi are two-jointed. The species are said 

 to feed upon fungi. It is desirable that observation should be made 

 upon their habits. The family is not a large one. Only a little 

 more than a score of species are now catalogued from the United 

 States. They are of medium or small size; our largest one meas- 

 ures less than half an inch in length. Fig. 170, Aradus 

 acictus, will serve to represent the form characteristic of 

 the family. 



Our genera can be separated by the following table :* 



A. Rostrum reaching only about to base of head, ventral surface FiG.170.— 

 of thorax and abdomen not furnished with a fine mesal furrow. acutus. 



(Sub-family Brachyrhyxchix.i i. 



B. Joint 4 of antennae much longer than joint 3 ; scutellum transverse, broad 



caudad, caudal angle obtusely rounded. 1. Aneurus. 



B. Joint 4 of antennae not longer than joint 3 ; scutellum scarcely transverse, 



triangular, caudal angle acute. 2. BRACHYRHYNCHUS. 



AA. Rostrum reaching about to caudal margin of prosternum or beyond it; 



ventral surface of abdomen and thorax furnished with a fine mesal furrow. 



(Sub-family Aradinse.) Aradus. 



Family XXVI. — TlNGITIl >.!..+ 



The Titigitidce are doubtless the most easily recognized of all 

 Heteroptera. The reticulated and gauze-like structure of the wing- 

 covers, usually accompanied by expansions of the prothorax of a 

 similar form, gives these insects a characteristic appearance which 

 needs only to be once seen to be recognized 

 in the future. Fig. 171 represents one of 

 these insects greatly enlarged, the hair-line 

 at the side indicating the natural size of the 

 insect. They are generally very small insects. 

 But they occur in great numbers on the 

 leaves of trees and shrubs. 



In this family the ocelli are wanting; the 

 rostrum and the antennae are both four- 

 jointed: the scutellum is wanting or rudi- 

 mentary, replaced by the angular hind portion 

 of the pronotum ; and the tarsi are two- 

 jointed. 

 The family is one of considerable size. There are about forty 



Fig. 171. — Corythuca. arcu- 

 ata. (From ihe Author's 

 Report for 1879.) 



* This table was prepared by Professor H. E. Summers, 

 •f Tingitidae . Tlngis, a proper name. 



