Orbis was described by Mr. Grote as follows: 



"Entirely concolorous drab or pale olive fuscous, shining; s.t. space 

 barely differentiated by its darker tint. All tiie lines faint, geminate, as in 

 allied species. Distinguished by its reduced, round, complete orbicular, and 

 small, upright reniform spots, annulated with pale; the orbicular distinctly 

 margined. Head and thorax concolorous. Hind wings concolorius, fuscous 

 with interlined fringes; beneath with discontinued common line." 



In Bull. Surv., IV, 174, Mr. Grote says: "Closely allied to alternata. 

 Stigmata complete; orbicular very small, pale ringed, spherical. Unicolor- 

 ous olivaceous gray, shining; terminal space hardly paler. Possibly a va- 

 riety of alternata, but the spots are concolorous." 



In the Proc. Am. Phil. Soc, XXI, 155, the suggestion that this may be 

 a form of cwpidissima is made, and I believe this is correct. At all events 

 it is easy in any series of cupidissima to pick out orbis or what fully an- 

 swers to the description. 



Laetula is said to be "Allied to cupidissima. This species is smaller 

 and has a line on the collar, and the thorax and fore wings of a burnt 

 brown, strewn with ochre scales, which fill the stigmata in one specimen, 

 and in the other leave the spots concolorous, while encircling them and 

 filling the geminate lines. Except in color, this form differs very little from 

 cupidissima, while seeming narrower and sh.orter winged. All the stigmata 

 shown. Hind wings and under surface as in cupidissima, which is a light 

 red species." 



In Can. Ent., X, 234, the reference to cupidissima is more positi\'ely 

 made, but in Bull. Surv. IV, 173, the following are indicated as distinctive: 



"Darker than the preceding (cupidissima), purple brown, with jdow- 

 dery ochrey markings; claviform indicated, collar vmlined, a little smaller 

 than cupidissima." 



The only specimen of laetula which I have seen labeled by Mr. Grote 

 did not agree with this description at all and was the same as the observa- 

 bilis of Mr. Graef's collection, belonging to the exsertistigma group rather 

 than here. Mr. Grote speaks of all these forms from California only. I 

 have them from California, Colorado, Arizona, Kansas, and British Co- 

 lumbia. 



Dr. Sraith's first complete description of trigona appeared in 

 Can. Ent. XL^ 287, 1908; and appears to be a good and accurate 

 one, except that the author has before him a number of very dark 

 forms, mostly from California. Also, the thoracic vestiture and 

 antennal characters, mentioned in this paper under the heading 

 Group Trigona, are omitted and appear to have been overlooked 

 by Dr. Smith. 



The following is quoted from Can. Ent., XL, 287, 1908: 



