614 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



I, 0.39(0.37-0.43); II, 0.63(0.60-0.66); III, 0.45(0.43-0.46); IV, 

 0.37(0.35-0.40). 



Pronotum: Length slightly more than half width, 1.36(1.32-1.44) : 

 2.56(2.47-2.63); anterior margin weakly, doubly emarginate; side 

 margins entire, gently curving on anterior third, with six submarginal 

 setigerous punctures; transverse impression more or less impressed 

 laterally, obsolete medially; anterior lobe with a curved, irregular 

 band of distinct punctures subapically and a patch of numerous 

 coarse punctures laterally; posterior lobe with several distinct punc- 

 tures medially and laterally. 



Scutellum: Longer than wide, 1.75(1.62-1.85) : 1.59(1.56-1.64); 

 disc polished and with numerous scattered punctures becoming finer 

 apically. 



Hemelytron : Corium and clavus polished ; clavus with one complete 

 row and one incomplete row of punctures; mesocorium with two 

 complete rows of punctures paralleling clavocorial suture, elsewhere 

 distinctly punctured basally and apically and much more finely so 

 medially; exocorium for its full length more densely punctate than 

 mesocorium; costa with one to three setigerous punctures; corio- 

 membranal suture nearly straight; membrane slightly longer than 

 basal width, distinctly surpassing apex of abdomen. 



Propleuron : Distinctly punctured only in the depression ; prosternal 

 carinae less than half as high as labial II. 



Mesopleuron : Evaporatorium reaching lateral margin and extended 

 anteriorly; polished area impunctate. 



Metapleuron: Peritreme free apically; evaporatorium virtually 

 straight laterally; polished area impunctate. 



Sternites: Shining, impunctate except for a few punctures behind 

 spiracles. 



Terminalia: Genital capsule with a shallow but distinct medio- 

 apical emargination ; surface with a few small punctures laterally. 



Length of body: 5.02(4.64-5.11). 



Female : Very similar to male. 



Head: Length-width ratio, 0.84(0.80-0.90) : 1.27(1.20-1.36); inter- 

 ocular width, 0.76(0.73-0.80). Antennal segments: I, 0.22(0.20-0.24) ; 



II, 0.25(0.23-0.27); III, 0.28(0.26-0.30); IV, 0.34(0.30-0.36); V, 

 0.41(0.40-0.43). Labial segments: I, 0.38(0.36-0.41); II, 0.62(0.56- 

 0.69); III, 0.49(0.46-0.53); IV, 0.41(0.40-0.43). 



Pronotum: Width-length ratio, 2.50(2.31-2.74) : 1.33(1.30-1.37). 



Scutellum: Length-width ratio, 1.70(1.56-1.89) : 1.53(1.43-1.75). 



Length of body: 4.79(3.98-5.50). 



Type data. — StM's type (Stock) of Aethus lugubris was from Kio 

 de Janeiro. Signoret's type (Wien) of nigrocinctus was from "Bresil"; 

 his type (Wien) of ohscurus was from "Ocana," Colombia, his type 



