AMERICAN MUTII.LID^. 231 



Blake in the genus Sph<eroj)hthalma, and may be regarded as typi- 

 cal representatives of" that genus. Blake's name Sph(Erophthalma 

 is antedated by Ephuta Say by nearly fifty years. 



FEMALES. 



Thorax elongate or pyriform 2. 



Thorax short, hexagonal 31. 



2. Thorax and abdomen, or the abdomen alone with dense pubescence, whicli, in 



many species, is very long 3. 



Insect not densely pubescent, frequently almost nude 17. 



3. Pubescence of thorax and abdomen concolorous 4. 



Pubescence of thorax and abdomen not concolorous 9. 



4. Pubescence of body above very long, white or yellowish 5. 



Pubescence short, as a rule fulvous or reddish, in one species whitish 11. 



5. Insect entii-ely clothed with long white pubescence, inclusive of legs 6. 



Insect with more or less black pubescence 7. 



(). Pygidium not longitudinally striated, ground color red gloriosa Sauss. 



Pygidium longitudiualjy striated, ground color black. 



pseiKiopappus Ckll. (var. of gloriosa'i). 



7. Pubescence of legs entirely black 8. 



Femora and tibise more or less with pHle yellowish pubescence. 



magna Cress. 



8. Pubescence dirty white, pertaining sometimes to ochraceous. 



Sai'kenii Cress. 

 Pubescence orange Saclteilii Cress., var. 



9. Keel of first ventral segment prominently produced anteriorly, size large- .10. 

 Keel of first ventral segment emavgiiiate or bidentate. Length 10 mm. 



zelaya Blake. 



10. Pubescence of abdomen above varying from fulvous to castaneous; head and 



thorax with tolerably dense pubescence orciis Cress. 



Pubescence of abdomen above pale golden yellow, that of head and thorax 

 sparse, leaving greater portion of those places bare leda Blake. 



11. Pubescence fulvous or reddish • 12. 



Head, thorax above, except a black band medially, two spots on second dor- 

 sal, its apex, the third entirely, the fourth and fifth laterally, apex 

 of second ventral, and third and fourth entirely witli whitish jiubes- 

 cence, dorsals 4 and 5 with black pubescence medially, giound color 

 red Sifheliana Sauss. 



12. Carina of first ventral segment prominently produced anteriorly 13. 



Carina of first ventral segment scarcely produced ; head and thorax above. 



second dorsal, except basal third, third and fou7-th dorsals laterally, 

 and fifth entirely with golden brown pubescence, ground color of 

 abdomen black. Length 10 mm Clio Blake. 



13. Second dor-sal black at base and apex, the fourth and fifth with red or fulvous 



pubescence, the process of first ventral segment rather acuminate. .14. 



Second dorsal red, or entirely clothed with red or fulvous pubescence, the 



fourth and fifth with reddish pubescence, the process of first ventral 



more or less truncate ... .15. 



TKANS. AM. ENT. SOC. XXV. JANUARY. 1899. 



