1918.] NATURAL SCIENCES OF PHILADELPHIA. 185 



terre-verte as opposed to olive-yellow (Ridgway). The bluish 

 tone, however, is more nearly that of typical Uavo-lineata than the 

 dark tyrian blue (Ridgway) of violacea (Thunberg). We refer the 

 Igarape-assu series to flavo-lineata, but do not consider it tj^pical, 

 as we do material from lower Amazonia and the Guianas. It is 

 possible that flavo-lineata and violacea may be geographic races of 

 the same species and the present series may show a step in the 

 intergradation, but until more material from a number of additional 

 localities is in hand this cannot be more than suggested. The 

 present series shows the usual amount of structural and general 

 brownish color variation in tone and tegminal maculation found 

 in forms of this genus. We feel that this genus should be placed 

 near Ahracris, to which it is undoubtedly close in relationship. 



Sitalces ovatipennis Bruner. 



1908. [Sitalces] ovatipennis Bruner, Biol. Cent.-Amer., Orth., II, p. 291. 

 [British Guiana.] 



Para. (C. F. Baker.) One male, one female. 



Igarape-assu. Three males, three females. 



This material has been compared with paratypic specimens from 

 Bartica, British Guiana. While they are always minute the tegmina 

 vary greatly in their exact shape and relative size. There is quite 

 a little variation in the extent to which the blackish of the post- 

 ocular regions and lateral lobes suffuses the dorsum of the thoracic 

 segments and the proximal abdominal segments. This is continuous 

 across the dorsum in some individuals, except for the pale longitudinal 

 lines, and in others is there completely replaced by olivaceous. This 

 is always correlated with general pattern depth and the two represent 

 intensive and recessive extremes. 



The species is here first recorded from Brazil. 

 Sitalces jugatus n. sp. (PI. I, figs. 34, 35.) 



A striking apterous species belonging to the section of the genus 

 containing S. apterus (Scudder),^^ debilis Rehn and probably others. 

 From apterus it differs in the slightly narrower dorsal section of the 

 frontal costa in the female, in the larger auditory tympanum, more 

 slender shaft of the cercus in the male, in the relatively shorter 

 and more robust caudal femora of the male, the more slender caudal 

 tarsi of the same sex and in some chfference in the color pattern of 



^^ We have examined one male and one female of the original one male and two 

 females of this species, which was described as an Ommatolampis (Proc. Boston 

 Soc. Nat. Hist., XVII, p. 273, (1875)), and find it is a Sitalces. Its relationship to 

 jugatus can be determined from the above diagnosis. 



