TETYRA. 13 
tending to a. variation which is lighter in coloration, and has the addition of two large 
rounded subapical spots to the scutellum ; H. proteus, S. punctellus, S. elongatus, S. de- 
planatus, and S. pecilus all have varieties in which this peculiarity is uniform. 
TETYRA. 
Tetyra, Fabricius, Syst. Rhyng. p. 128 (1803) ; Stal, Ofv. Vet. Akad. Férh. 1867, p. 492; En. Hem. 
i. p. 4 (1870). 
Macraulax, Dall. List Hem. i. p. 36 (1851). 
This genus is well represented in Central America. It is found as far north as Texas, 
and extends southwards to Colombia, Brazil, and the Argentine Republic. Of the five 
known species, only two remain unrecorded from this region, 7. e. T. pinguis, Germ., 
which has only been as yet announced as received from Jamaica, Cayenne, and Brazil, 
and 7. pecila, Berg, lately described from the Argentine Republic. Mr. Dallas 
founded the genus Macraulax for Pachycoris bipunctatus, H.-S., two specimens of which 
he recorded from Australia. The late Prof. Stal, however, described Herrich- 
Schaffer’s species as being a Texan and Mexican Hemipteron, specimens of which are 
contained in the Stockholm Museum ; and he also considered (probably from an examina- 
tion of the same) that the Texan form Macraular tristis, Uhler, was a synonym of the 
same species. 
The fundamental characters by which Stal has differentiated this genus from the 
following are—‘‘ Segmento sexto ventris utriusque sexus apice sensim rotundato-sinuato 
vel medio subrecto, marginibus imis lateralibus anticis thoracis haud reflexis.” The 
third joint of the rostrum is much longer than the fourth. 
1. Tetyra bipunctata. 
Pachycoris bipunctatus, Herrich-Schi ffer, Wanz. Ins. iv. p. 87, f. 420 
Macraulax bipunctatus, Dall. List Hem. i. p. 36, tab. i. f. 43. 
Macraulax tristis, Uhler, Proc. Ent. Soc. Philad. i. p. 212. 
Tetyra bipunctata, Stal, En. Hem. i. p. 4°. 
Hab. Norra America, Baltimore?, Texas?.—Mexico?.—Avstratia! 2? 
This species is readily differentiated from the two following ones enumerated by the 
length of the rostrum, which extends to about the middle of the abdomen. ‘The abdo- 
men has also a distinct central furrow. 
2. Tetyra arcuata. 
Cimex arcuatus, Fab. Ent. Syst. iv. p. 83. 121. 
Tetyra arcuata, Fab. Syst. Rhynch. p. 184. 26; Schjddte, in Kroyer’s Nat. Tidsskr. iv. p. 292. 12; 
Stal, Hem. Fab. i. p. 18. 1%; En. Hem. i. p. 43, 
Pachycoris arcuata, Germ. Zeitschr. i. p. 92. 214. 
