...and variegated with dark brown and straw color. On the under side it is of the same color, but not variegated in the same way, there being a dark spot...cavity at the anterior and under part of the head. The eyes are purplish brown, and three small eyelets are distinctly visible on the top of the head....

...fly, a little over a quarter of an inch long, of a yellowish colour, dotted and variegated with dark brown. The under side of the head is puffed out and white ; but this fly has no mouth parts, and cannot, therefore, take any nourishment when fully matured....