314 PENTATOMID^. 



tSi/nojJsis of Genera. 



A. Basal joint of antenna; extending beyond 

 the apex of head. 



a. Mesosternal ridge not produced backward 



between intermediate coxse. 



a. Mesosternal ridge not or very slightly 



extending bej'ond anterior margin of 



prosteruum. 



a'. Pronotal angles not prominently 



produced ; pronotum anteriorly 



punctate, not levigate Acanthosoma, p. 315. 



b'. Pronotal angles strongly or 

 spinously produced ; pronotum 



anteriorly levigate Sastbagala, p. 318. 



h. Mesosternal ridge extending consider- 

 ably beyond anterior margin of pro- 

 sternum Anaxandea, p. 321. 



b. Mesosternal ridge produced backward 



between intermediate coxae . Elasmosthetus, p. 326. 



T). Basal joint of antennte not reaching apex 



of head Microdeuterus, p. 314. 



Genus MICRODEUTERUS. 



Microdeuterus, DaN. List Hem. i,p. 299 (1851); StcV, Ofv. Vet.-Ak. 



Fork. 1870, p. (340; id. En. Hem. v, p. 110 (1876), 

 Acanthosoma, part., Hen:-Sch. Wanz. Ins. viii, p. 5 (1848). 



Type, 21. megaceplialus, Herr.-Sch. 



Distribution. Oriental Region. 



Head large, rounded in front, lobes o£ equal length ; antennae 

 of five joints, basal joint stout, not reaching apex of head, second 

 joint minute, third longest ; rostrum long, reaching the base of the 

 abdomen; body elongate-ovate ; pronotum gibbous, lateral angles 

 not pi'oduced, the margins distinctly prominent and levigate ; scu- 

 tellum small, longer than broad; membrane with longitudinal veins ; 

 sternum with a strong central laminate keel, widened and rounded 

 anteriorly, about or almost reaching base of bead ; ventral spine 

 short, scarcely passing the posterior cox*, 



506. Microdeuterus megacephalus, Herr.-Sch. (Acanthosoma) Wanz. 

 Ins. viii, p. 5, f. 783 (1848) ; Stdl, Ofv. Vet.-Ak. Fork. 1870, p. 640. 



Ocbraceous, brownly punctate, more thickly punctate on pro- 

 notum and corium, scutellum more sparsely punctate on apical area, 

 head very finely and obscurely punctate ; margins of pronotum 

 distinctly levigate ; scutellum with a more or less well-defined 

 large blackish spot onbasal area, and with a distinct central luteous 

 le\igate carination, on each side of which at apical area the surface 

 is furrowed, its apex blackish ; corium more or less purplish on 

 apical area ; connexivum purplish-brown \^ith luteous spots, the 



