48 HETEROMERA. [Osphya. 
O. bipunctata, F. (preusta, Ol.; o clavipes, Ol.). Elongate, de- 
pressed, clothed with close greyish pubescence; male greyish-black 
with the front of head, borders of the thorax and a longitudinal line on 
the latter of varying width, and sometimes absent, yellowish-red ; the 
elytra are also sometimes narrowly yellowish-red at margins; female 
with the thorax red, with the margins yellowish, and with two spots of 
varying size, rarely absent, on disc ; elytra brownish-red, sometimes with 
the apex, and rarely with the external margins, black; head finely 
punctured, antenne long and slender, dark with the base yellow; thorax 
almost transverse-oval, all the angles being rounded, closely and finely 
punctured ; scutellum triangular; elytra at base a little broader than 
thorax, subparallel, and more coarsely punctured than thorax ; legs red- 
dish-testaceous, with the apex of the femora, and more or less of the 
tibiz, and the tarsi, black. L. 5-10 mm, 
Male with the posterior femora more or less strongly thickened or 
simple ; female with the posterior femora always simple ; the colour of 
the sexes is variable in some instances. 
On the flowers of the white-thorn ; rare; Monks Wood, Cambridge, where most of 
the British specimens have been taken ; Windsor ; Weston-on-the-Green, Oxon, May 
1830 (Matthews) ; Scarborough (G. A. Wright) ; according to Curtis they stick so 
fast to the bushes that they are detached with great difficulty, and this may partly be 
the reason of their being so seldom seen. 
PYTHIDA. 
This is a small family, containing about a dozen genera and fifty or 
sixty species; the genus Mycterus is included under the Pythide by 
some authors, and by others under the Melandryide or Cidemeride ; if 
we include it under the Pythide, the family is represented in Europe 
by six genera and twenty-tive species, of which four genera and ten 
species occur in Britain ; the majority of the species appear to occur in 
Europe and North America; a few, however, are found in Chili, New 
Guinea, Tasmania, &c. The following are the chief characteristics of the 
family :—Head prominent, free, eyes entire, maxille with flattened 
ciliate lobes, maxillary palpi moderate ; antenne 11-jointed, filiform or 
slightly thickened towards apex ; thorax narrowed at. base, with the 
sides not margined ; anterior cox more or less conical, usually conti- 
guous ; mesosternum moderately long; elytra rounded at apex, covering 
abdomen ; legs moderate, tibie slender with the spurs small but distinct, 
claws simple; abdomen with five free ventral segments ; the species vary 
very much in size and shape. 
The following two tribes may be thus distinguished : — 
T. Intermediate cox with trochantin; side pieces of mesosteruum 
reaching the intermediate coxe ; form large, much depressed. . PYTHINA. 
II. Intermediate coxee without trochantin; side pieces of 
mesosternum not reaching the intermediate coxe ; form smaller, 
more or less convex. 
