448 AVIDM. 



Key to the Species. 



A. Abdomen ■witli non-pubescent transverse 



fascife. 

 a. Postscutellum armed with two spines or 

 teeth posteriorly. 

 a . Abdomen beneath and posterior legs 



black : leno^th ll-l-') mm N. elliolii, p. 449. 



v. Abdomen beneath and posterior legs 



rufo-testaceous : length 8 mm N. westwoodii, p. 449. 



h. Postscntellum unarmed posteriorly. 



a'. Thorax with more or less fulvous 

 pubescence. 

 (r. Legs rufo-fulvous or ferruginous. 

 a^. First abdominal segment without 



a transverse fascia N. chalybeata, p. 4-50. 



5^. First abdominal segment with a 



transverse fascia N. ctirvi2)es, p. 4.j0. 



b'. Lejrs fuscous black,sometimes piceous. 

 a^. Mesonotum above with dense 



short rufo-fulvous pubescence . . N. thoracica, p. 4ol. 

 b^. Mesonotum above without or at 

 most with very pale fulvous pu- 

 bescence N. fonnosa, p. 451 



b'. Thorax with griseous or white pubes- 

 cence. 

 a-. Enclosed space at base of median 

 segment longitudinally rugose. 

 a^. Clvpeus with a medial vertical 



carina iV". iridescens, p. 4-52. 



b^. Olypeus not carinate N. aloof asciata, p. 452. 



b-. Enclosed space at base of median 



segment coarsely punctured N. carinata, p. 453. 



B. Abdomen with pubescent transverse fascife, 



a. Fascipe at bases of abdominal segments 



only N. basalts, p. 453. 



b. Fascipe on margins of abdominal segments 



only. 

 a'. Abdomen black with base red. 



a^. Abdominal fascife pale fulvous .... N. flomlis, p. 453. 

 b^. Abdominal fascife silvery white .... N. pilipes, p. 454. 

 b\ Abdomen except fasciiB unicolorous. 

 a^. Abdominal fascifE golden or some 

 shade of yellow. 

 a^. Enclosed space at base of median 

 segment longitudinally striate or 

 rugose. 



n*. Length 14-15 mm N. antennata, p. 4-54. 



V. Length 8-10 mm N. aurifrons, p. 455. 



h^. Enclosed space at base of median 

 sefrment pvmctured. 



a*. Length 5 mm N. capitata, p. 455. 



6*. Length over 8 mm. 



a^. Olypeus rounded anteriorly . . N. coinbusfa, p. 456. 

 b^. Clvpeus transverse, somewhat 



produced anteriorly N. clypeata, p. 456. 



c". Enclosed space at base of median 



segment coarsely reticulate .... N. fervida, p. 456. 



