4 PROCEEDHSTGS OF THE NATIONAL MUSEUM vol. 72 



2. Thinned area at about middle of costa, whicli is there slightly angulate- 

 emarginate, membrane with a slightly thickened band proceeding from 

 radial portion of corium and nearly paralleling radial margin, and with 

 few or no strong veins (fig. 6) ; metapleural ostiole like a puncture, and 

 difficult to see, with no opaque area adjacent ; first sternite well exposed 

 for its entire width (except in 31. majuscula), half as wide as second, 

 sutures between sternites terminating laterally at about level of spiracles 

 (fig. 3) ; antenna apparently 4-segmented, ring segment indistinguishable 

 without clearing; tarsi with 2 segments; sensory hairs transversely 



arranged Megaridinae. 



Thinned area at end of costa ; radial apex of corium rather heavily chitinized 

 and somewhat produced, serving as a base for several strong veins, the 

 course of which is as shown in Figure 20 ; metapleural ostiole prominent, 

 with more or less extensive opaque area adjacent; first sternite briefly 

 exposed, evanescent both medially and laterally ; sutures between sternites 

 not extending laterad to level of spiracles (fig. 23) ; antenna obviously 

 5-segmented ; ring segment of antenna distinguishable without clearing ; 

 tarsi with 3 segments ; sensory hairs longitudinally arranged. — Canopinae. 



Subfamily Megaridinae 

 There is only one genus known, namely : 



Genus MEGARIS Stal 



Cyrtaspis Stal, C, Bidrag till Rio Janeiro-traktens Hemipter-Fauna, Svenska 

 Vet.-Akad. Handl., vol. 2, No. 7, 1860, p. 9 [Monobasic, genotype, C. nigritula 

 n. sp. Brazil], 



Megaris Stal, C, Svenska Vet.-Akad. Handl., vol. 3, No. 6, 1862, p. 57. 



" The name Cyrtaspis has previously been used for another genus," 

 is Stal's remark. The genus in question is one of Orthoptera de- 

 scribed by Fischer in 1853. 



Besides the characters mentioned in the key to subfamilies, com- 

 mon characters of the species of Megaridinae before us are: punc- 

 tures of pleural surfaces ringlike ^ giving a somewhat dull appear- 

 ance to these surfaces, though of an entirely different type from 

 that of the opaque, corrugated, and apparently less heavily chitinized 

 areas surrounding the ostioles in the other subfamilies here treated, 

 and in many other Pentatomids; anterior margin of the head, and 

 anterior and lateral margins of pronotum, carinate and slightly re- 

 flexed ; the apex of head usually is more or less emarginate (figs. 8, 

 9, 12, 15) ; the costa has a prominent rounded margin, and the corium 

 bears a single central longitudinal series of large punctures; the 

 pronotum is emarginate near the posterior lateral angle for recep- 

 tion of base of fore wing, and has a prominent polished convexity 



=■ This appearance is due to greater prominence of the central papilla of each puncture 

 which reaches the same elevation as the remainder of the surface and is flattened above ; 

 In the other groups the papilla is lower and does not destroy the pitlike appearance of the 

 puncture. 



