Mr. T. I). A. (Jockcrcll on 13jcs. 20 



the following;; cliaractors : — 'riiii-il aiitoniial joint much .sliorlor, 

 being liardly lon;;er than its apical breadth ; fourth also 

 shorter; flaj;elluni anil)er-colourcJ on both sides, thoui^h 

 darker above; wings without the yellow shade; scutelliun 

 and axillie of the sanie red colour as the nie.sothorax ; hind 

 femora without a black stain in trout, though there is one 

 behind ; second al)dominal segment with a large pyriform 

 white mark on each side; the white on segments 2 to 5 

 ijiterrupted sublaterally, 5 with a good deal ot" red ; a[)ical 

 ventral bristles largely |)ali'. 



Jlah. Prospect Ijake, Colorado Spring.^, Colorado, Mav 22, 

 11104 (2'. tO ir. CUL). 



Named after the greatest living authority on Apoidca. 



jS'ornada semiscUa, ?p. n. 



. (J. — Length 7f| mm. 



Kuns in my tables to X. scitiformls and has no supra- 

 clypeal mark, but differs thus: — Face-marks lighter yellow ; 

 lateral marks larger, reaching to the level of the antenine ; 

 fourth antennal joint shorter, not much longer than tifth ; 

 pubescence of thorax &.c. white, not at all yellow ; basal 

 nervure meeting transvei so-medial ; spine of anterior cox.i 

 short and red; abdominal markings very pale yellow on lirst 

 segment, bluish white on the others ; apical plate dark rod 

 (black in scitifonnis). 



Jlah. Pros|)ect Lake, Colorado Springs, Colorado, May 22, 

 1904 (7'. cO W. CklL). At Howers of a Senecio of the group 

 IS. aureus. 



Although this and the last were taken at the same time 

 and place, I do not feel at liberty to consider them sexes of 

 one species. Not only do the tegulte ditier in colour (bright 

 ferruginous in FrieseanOj pale yellow in semiscit(i), but tlie 

 third submarginal cell in semiscita has a small apj)endicular 

 nervure, wholly wanting in Frieseana and scidjonnis. In 

 life the eyes of Friescana ? are pale red, of semiscita (^ pale 

 yellowish green, 



Xylocopa nautlana, sp. n. 



? . — Length about .'>0 mm. 



JSimilar to A', morio (Fabr.), with the same shining black 

 body, black pubescence, and brown-black wings with a strong 

 purple iridescence. The labrum has the same three pro- 

 tuberances, the clypeus has the sanie structure, and th(> 

 punctuation is about the same. Tite second abdominal 

 !»rgment has very numerous, small, feebly-impressed punc- 

 tures, whereas in morio it is smooth, with scattered, mostly 



