I06 ENTOMOLOGICAL NEWS. [April, '03 



1. Abdomen rather evenly, coarsely and distinctly punctured, segment 



5 more or less black ; clypeus and mesonotum sparsely punc- 

 tured, the former a little more coarsely ; cell I II 5 short, its 



sides parallel arvensis. 



Abdomen, at least segment i, impunctate or nearly so 2. 



2. Mesonotum shining, sparsely punctured, not sulcate, sometimes with 



a median raised line ; abdomen entirely red, almost impunc- 

 tate minor. 



Mesonotum less shining, more closely punctured, strongly sulcate ; 

 segment 5 black, 2-5 rather distinctly punctured basally. 



clematidis. 



MALES. 



Flagellum submoniliform, without distinct facets beneath ; abdomen red, 

 segments 3-6 more or less black clematidis. 



Flagellum with joints 4-13 notched beneath and presenting distinct facets; 

 abdomen entirely black i. 



I. Vertex with a distinct tubercle ; mesonotum with coarse confluent 

 punctures ; abdomen more shining, less closely punctured, 



apex thinly pubescent heraclei. 



Vertex ordinary ; mesonotum with punctures less coarse, more dis- 

 tinct ; abdomen more opaque, more closely punctured, more 

 closely pubescent arvensis. 



SPHEGODIUM. 



FEMALES. 



Flagellum, mandibles, tibiae, tarsi and abdomen red ; head and meson- 

 otum closely and finely punctured ; cell III 5 very short ; en- 

 closure short, semicircular pimpinellae. 



Flagellum, tibiae and tarsi darker i. 



1. Enclosure distinct, coarsely reticulated ; labrum entire ; mesonotum 



usually greenish, shining ; segments 4-5 usually black. 



cressonii sp. nov. 



Enclosure short, poorly defined, with longitudinal raised lines ; 



labrum more or less emarginate ; mesonotum black .... 2. 



2. Abdomen entirely black ; slender smilacinae. 



Abdomen red, except segments 4-5 ; robust pycnanthemi. 



MALES. 



Enclosure short; scutel closely punctured, rather opaque; abdomen with- 

 out red ; vein rm wanting in known specimens . . . pimpinellae. 



Enclosure longer; scutel sparsely punctured, shining; abdomen more or 

 less reddish; fresh specimens compared with Machcsris stygia 

 have the pubescence longer, whiter, more dense, especially 

 on clypeus; antennae, tegulae, nervures and reddish color of 

 abdomen, when present, paler; mesonotum anteriorly, pleura 

 and metathorax less coarsely reticulated cressoini. 



