274 Dr. F. B. White's list of 



These and the following species of Sigara form a group 

 distinguished by several characteristics. The scutellum is 

 larger, being as long or longer than the head seen from 

 above ; the pronotum is very short, much shorter than the 

 head or the scutellum, and somewhat crescentic in shape ; 

 and at the base of the clavus is a pale V-shaped mark, of 

 which one limb rests on the basal mai'gin, and the apex 

 fills the inner basal angle. Many of Dr. Trail's specimens, 

 having been preserved in alcohol, are not in the best con- 

 dition for determination, as when dried the pronotum and 

 hemelytra get more or less distorted. The most evident 

 distinction between the species are the markings of the 

 hemelytra, the comparative stature, and the shape of the 

 head. The species just described {S. selecta) can be 

 readily separated from the others by its larger size and 

 indistinctly-mottled hemelytl'a* 



21. S. signata, n. sp. 



Dilute fusco-grisea, subtus pedibusque griseo-albidis ; 

 clavo sutura, margine interiore et vitta discali, corio 

 lineolis longitudiualibus nonuullis plus minus fractis irre- 

 gularibusque aurautio-rubris. 



Long. 3 mm. 



Hah. — Rio Purus (November, 1873). Nine specimens. 



Readily distinguished by the orange-red markings, which 

 vary in intensity, and are in the form of dots and blotches, 

 and not in regular bands. 



22. S. socialis, n. sp. 



Brunneo-fusca, capite, subtus pedibusque fusco-albidis ; 

 clavo marginibus irregulariter, corio lineolis longitudi- 

 nalibus plus minus indistinctis, area marginali maculis 

 3 fuscis ; membrana elytri sinistrorsi leviter infuscata ad 

 apicem corii macula fusca notata ; femoribus posticis 

 subtus vitta et serie punctorum fuscis ssepissime notatis ; 

 vertice subquadrato, margine postico longitudine media 

 subfequilongo. 



Long. 2\ — 2| mm. 



Hab. — Rio Madeira up to Sao Antonio da Boa Vista 

 (June, 1874); Anana, Upper Amazon (September, 1874); 

 Urubu Caxoeira, Rio Jurua (November, 1874); Rio 

 Trombatas (March, 1875) ; and Manaos (August, 1875). 

 Very many specimens, " at light," &c. 



Varies very much in the degree of coloration and 

 markings. In some cases tl>e hemelytra have only pale 



