Brunf-r : South American Tf.trigid/E. 115 



species of very long-winged sk-nder insects. Five species have been 

 recognized heretofore and two are now added. Tliey may be separated 

 by the subjoined table. 



Synopsis of the Species of Allotettix. 

 A. Sides of frontal costa rather strongly divergent below. Posterior angles of 

 lateral lobes of the pronotum angulate and directed gently outward. Teg- 

 miqa unicolorous, fuscous. Maxillary palpi with outer joints strongly di- 

 lated fuscipennis sp. nov. 



A A. Sides of frontal costa only gently divergent. Posterior angles of the lateral 

 lobes of the pronotum turned down. Terminal joints of the maxillary 

 palpi only gently dilated. 

 h. \'ertex decidedly narrower than one of the eyes. Pronotum lacking consid- 

 erable of reaching the tips of the wings americanus Hancock. 



bb. Vertex little, if at all, narrower than one of the eyes. Pronotum extending 

 caudad nearly or quite as far as the greatly lengthened wings. 

 c. Smaller (11-14.5 mm.). 



d. Middle femora with the carinae not at all foliaceous or undulate, always 

 fully three times or more as long as wide. 

 e. Pronotum on disk back of the humeri concave. . .periivianus Bolivar. 

 ee. Pronotum on disk back of the humeri not concave, .chipmatti Bruner. 

 dd. Middle femora with the carinae somewhat foliaceous or undulate, some- 

 times little more than twice as long as wide. 

 e. Middle femora undulate but not at all foliaceous, about three times as 



long as wide cayennensis Bolivar. 



ee. Middle femora with the carinae somewhat foliaceous, but a trifle more 



than once again as long as broad chapadensis sp. nov. 



cc. Larger (16-17. 5) prolongatus Hancock. 



Allotettix fuscipennis sp. nov. 



A moderately large and comparati\ely robust species in which the 

 vertex is nearly or quite as wide as one of the prominent eyes, and the 

 posterior lateral edges of the pronotum are angulate and turned out- 

 ward. General color brownish testaceous, the tegmina fuscous. 



Head of moderate size; eyes large, prominent, subglobose, separated 

 above by a space nearly or quite equal to the width of one of them; top 

 of head granulose, depressed, provided at the middle with a fairly promi- 

 nent longitudinal carina beginning at a point a little in advance of a line 

 drawn between the back edge of the eyes and extending forward, uniting 

 roundly with the upper end of the frontal costa; the latter not very 

 prominent, viewed laterally roundly produced between the antennae, pro- 

 foundly sulcate and with the walls quite widely divergent below; vertex 

 depressed, not advanced as far as the eyes, the lateral carinae rather 



