208 AMERICAN HYMKNOP'l'EKA. 



nenton meta; scutelliim broad, flat and distinctly margined on sides 

 and apex. Legs rather short ; femora swollen, but not as much as 

 in Exochus. Wings without areolet. Abdomen sessile, with second 

 and often third and fourth segments with longitudinal carinae. 



Our species may be separated by the following minute, though 

 apparently constant, characters : 



Metapleura entirely smootb, or with two or three sliort carinse converging to the 

 junction with hind coxse. 

 Second abdominal segment with only a median carina, or if more it is rugosely 

 aciculate. 

 Abdomen not constricted between second and third segments; face yellow. 



carinatus Cress. 

 Abdomen strongly constricted between segments two and three; face rufous. 



conslrictUN n. sp. 

 Second abdominal segment with a median and two distinct lateral carinse. 

 Metathorax with seven longitudinal carinse; upper center of second recur- 

 rent nervure with a long stump of a vein extending into the third 



discoidal cell excessorius n. sp. 



Metathorax with six carinse, or a partial seventh. 



Basal segment of abdomen with four carinse texaiiiis Cress. 



Basal segment with five carinse. 



Face black, with pale orbital lines opacitas n. sp. 



Face yellow, or reddish yellow farinigei* Walsh. 



Metapleura longitudinally aciculate. 



Mesopleura longitudinally or diagonally aciculate above middle coxae; three 

 distinct carinse on third abdominal segment. 

 Upper part of metapleura either aciculate or distinctly punctured. 



oiiiti$« n. sp. 

 Upper part of metapleura smooth, polished. 



Posterior femora rufous ; carinse on third abdominal segment large, distinct. 



costatus n. sp. 

 Posterior femora black ; carinse on third abdominal segment short, weak. 



pusilliis n. sp. 

 Mesopleura polished above middle coxse. 



Third abdominal segment without carina; face and hind coxse black. 



pleturus n. sp. 

 Third abdominal segment with carinse at base ; face ferruginous; hind coxse 



rufous, dusky at base niarlatti Ashm. 



C'horiiiteus carinatiis Cress. {Tryphon), Proc. Ent. Soc. Phil. iii. 273. 

 ('. californicus Ashm.. Trans. Amer. Ent. Soc. xxiii, 200. 

 % 9 . — 6-7 mm. Black, pilose, with face, palpi, sometimes scape beneath, 

 tegulse, and more or less of venter, lemon-yellow ; legs ferruginous, with base of 

 posterior tibise, four anterior coxse, trochanters, and apex of femora, yellowish ; 

 sometimes posterior coxse are blackish ; antennse long, reddish brown ; mesonotum 

 shining, sparsely punctured and with median depression; metanotum shining, 

 the two median carinse widely separated ; metapleurse polished and with a few 

 short carinse converging to the hind coxse; wings nearly hyaline, nervures and 

 stigma reddish brown; abdomen often scabrous on first two or three segments. 



