19S [Fehniary, 
See Biirmeister's genera {Typldocyha), and of. remarks by Tollin, iiher 
Kleinzirjyen, in the Stett. Ent. Zeit., 1851, p. 67. For the discrimina- 
tion of species, the best characters are those derived from the neuration 
of the hemelytra and wings, in which the following arrangements are 
to be observed ; On the corium are three longitudinal nerves, not con- 
nected transversely, and therefore forming no discal cells ; they are 
often invisible, except in their apical half. The two outer are united not 
far from the base, and at the base all three are joined. The membrane 
is long as compared with tliat of lassus ; its nervures are conspicuous, 
forming sti'ictly four cells, but of these the first (or outer one) is some- 
times very small, or vanishes, leaving apparently ^only three. The 
second cell of the membrane is sessile or pedunculated ; the third is 
either trapezoidal (broader at the apex than at the base), or its sides are 
straight or parallel. The membrane is rarely appendiculated. The 
wings have sometimes a sub-marginal nervure, receiving the extremities 
of the longitudinal veins ; in other cases the latter terminate immedi- 
ately in the margin itself. At the apex of the wings 2-4 longitudinal 
veins are to be seen, united transversely ; one at least of them ia forked 
near the base, and frequently two of them form bifurcations open to- 
wards the margin. The nei'vures and cells are with difficulty seen in 
these small insects, especially when dried. The best method which I 
have hit upon is to detach the hemelytra or wings from a fresh specimen, 
and stick them with water upon thin glass. They may then be ex- 
amined with ease, as transparencies. In all cases the insects should be 
set with wings open, or their identification may be impossible. The 
species found in Livonia are elaborately tabulated by Mor, according to 
their neuration and the structure of the genital organs. But, as the 
difficulty of verifying these characters by pulling specimens to pieces, 
and by the microscope, is somewhat deterrent, we will attempt a more 
exoteric method, founded upon markings and general appearance, using 
the less visible characters only in cases of necessity. This rough and 
ready way will, for the most part, apply only to typical forms, but will 
place a large number of species at once beyond doubt. 
I. Mcmbrana appendiculata. Alarum nervi lougitudinales 4. 
(Prouotum ct hemelytra lineis citrinis plerumque ornata. Sed 
variat ultra modum) albostriellus, Fall. (1) 
II. Membi-ana haud appendiculata. Alarum nervi longitudi- 
nales 3-2. 
i. Vertex ut in Deltocepludo pi-odnctus, iironoto 3 brevior. 
(Parvus, pallidus, immaoulatus) citrineUus, Zott. (2) 
ii. Vertex late rotundatiis, pronoto ^ brevior. 
