G. C. DAVIS. 215 



Posterior tibite pale, dusky or rufous at apex, and sometimes white at base. 

 Thorax with white humeral stripe or triangular spot in front of tegulse, scutel- 

 lums more or less pale. 

 Mesonotum black; abdomen finely punctured ; first and second lateral areas 

 of metathorax separated. 

 Abdomen black, or at least with only one or two segments narrowly pale 



at their apex pallipes Cress. 



Abdominal segments two and three with lateral apical corners broadly 



yellow var. pleiirali!« Cress. 



Mesonotum rufous, scutellums entirely yellow ; abdomen coarsely i)unctured ; 



first and second lateral areas of metathorax united .osteiitittiis n. sp. 



Thorax without white spot or line in front of tegulte ; scutellums black ; i)oste- 



rior femora and coxse dusky to black flavifi'Oii talis n. sp. 



Posterior tibiae unicolor. 



Abdomen black, or with apical margins of segments narrowly pale. 

 Second abdominal segment polished or finely punctured ; legs entirely ru- 

 fous ; no pale line in front of tegulse propinquiis Cress. 



Second abdominal segment coarsely punctured : coxpe usually black ; pale 



liue in front of tegul* usually present atricoxalis Cress. 



Abdomen rufous, black at base, or base and apes seinii'uf'iis Cress. 



Exochiis albiceps Walsh, Trans. St. Louis Acad, iii, 96. 



% .—4 mm. Rufous, with spot enclosing ocelli, lunate spot on occiput, spot on 

 each lobe of mesonotum, dorsal spot on segment five of abdomen and the whole 

 of segments six and eight, black ; head, except the black portion and rufous face, 

 white ; thorax glabrous, polished ; metathorax completely areolated ; basal seg- 

 ment of abdomen carinate on basal half. "Legs are all dull luteous, with an 

 abbreviated exterior vitta on each femur and an unabbreviated one on each tibia." 



One male from Illinois. Type not seen and unknown. 

 Description taken from Walsh's. 



Exoclius dorsalis Cress., Proc. Ent. Soc. Phil, iii, 286. 



5 % . -5-7 mm. A variable species, whose general color is black, varied with 

 honey-yellow and white; the head varies from black with dark rufous face, 

 mouth-parts and cheeks to occi])Ut and ocelli black, with the remainder of the 

 head lemon-yellow; antennae black to pale rufous; thorax varies from black with 

 entire venter, meso- and metapleurae. tegulae, stripe in front and scutellums ru- 

 fous, to the entire thorax being honey-yellow, with scutellums, tegulae and stripe 

 in front, yellowish white; abdomen varies from entirely black to pale piceous at 

 base, growing darker toward the apex ; the legs vary from rufous with posterior 

 tibiae black with white aunulus and tarsi white, to all the legs being whitish, ex- 

 cept the honey-yellow posterior coxse and black base and apex of posterior tibiae ; 

 thorax and abdomen shining, sparsely punctured ; metathorax with the first and 

 second areas sometimes separated, sometimes not; wings hyaline, veins and 

 stigma brown. 



This great variation is gradual and not due to sex or locality. 



Five females and two males from Michigan, Canada, Illinois, 

 Colorado, New Jersey and Mt. Washington, N. H. (Mrs. Slosson). 

 Type, coll. Amer. Ent. Soc. 



TR.\NS. .\M. KNT. SOC. XXIV. AUGUST. 1897. 



