162 MONOGRAPH I A 



Head subquadrate, pale, chestnut-yellow, the angles 

 shaded and much deeper chestnut, less in width in the female 

 than the abdomen ; clypeus convex, margin, together with 

 the anterior bands, chestnut, temporal angles less produced 

 than the preceding, but more acute, occipital markings 

 pitchy, vertex concave ; antennae pale, yellow, and slender 

 in the female, the first joint in the male large and thick, 

 margin entire; eyes promiment and black; prothorax 

 transverse, anteriorly convex ; metathorax with the anterior 

 margin convex, with a dark chestnut uncinate fascia, pos- 

 terior sinuated and much produced ; abdomen pale, yellow- 

 white, obovate, lateral margin bright chestnut, each segment 

 except the antepenultimate with a pitchy sutural, somewhat 

 club-shaped fascia; legs chestnut yellow, the superior edge 

 dark, thick, and strong ; femora large ; tibiae spiny. Length 

 <? 1 9 H. 



Common upon both the Black and Red Grouse (Tetrao 

 Tetrix and Scoticus) ; upon the Willow or Hazel Grouse 

 (Tetrao Saliceti) I find a similar but distinct species ra- 

 ther broader in the abdomen, and of much darker colour. 

 What infests the Ptarmigan (Tetrao Lagopus) I have never 

 been able to ascertain. 



8. GONIODES DISSIMILIS. (Louse of the Domestic Fowl.) 



Plate XII. Fig. 6. 



Tawny, smooth, shining, and pubescent; head large, 

 subquadrate, temporal angles prominent, with two broad 

 chestnut fascia before the antennae ; prothorax short arid 

 transverse ; abdomen large, lateral fasciae confluent, with 

 deep chestnut sutural bands on the superior margin of each 

 segment. 



Goniodes dissimilis. Nitzsch. Germ. Mag. Hi. p. 294. Goniodes dissimilis. 

 Stcph. Syst. Cat.pt. ii. p. 333. 



