1928] 
A New Bee of the Genus Andrena 
63 
tellum dull and densely punctured, the surface covered with 
short stiff very bright fox-red hair, which also covers postscu- 
tellum, and extends down sides of thorax to cover tubercles and 
immediately adjacent parts; sides of metathorax with pale hair, 
which carries a great quantity of the orange Senecio pollen; 
mesopleura with black hair; wings dusky, darker apically; stig- 
ma well developed, rufo-piceous; nervures dark brown; second 
cubital cell broad, receiving recurrent nervure a little beyond 
middle; legs with black hair, spurs brown; abdomen shining, 
finely and rather closely punctured, without bands, hair at apex 
black; second segment depressed more than half, but hardly 
two-thirds. The area of metathorax is broadly triangular, with 
about sixteen strong longitudinal rugae. The tongue is remark- 
ably short, broad and pointed. 
The problem of the independent production of superficially 
similar species of insects is an interesting one. I do not know 
whether the two species just discussed are really very closely 
related, but they are at any rate both Trachandrena. In Cali- 
fornia, there is another species with the same appearance, A. 
macrocephala Ckll., the female of which was taken by Mr. 
Timberlake at Riverside, at flowers of Phacelia distans, March 8. 
This even agrees wit A. seneciophile in the black-haired pleura 
and black hair at end of abdomen. Yet it is not even a Trachan- 
drena, and the structure of metathorax and second abdominal 
segment are entirely different. In the Mediterranean region, 
there is a Senecio-\ isiting species, A. senecionis Perez. I have it 
from Spezia, Italy (Morice). It has rufescent dorsal hair, but is 
not a Trachandrena. 
