Opatrina. } HETEROMERA. 9 
species ; of these two genera represented by two species are indigenous 
to Britain. 
I. Last joint of maxillary palpi securiform ; posterior cox 
more distant, with the portion of the first abdominal seg- 
ment included between them truncate at apex . . . . . OpatTRuM, F. 
II. Last joint. of maxillary palpi ovate ; posterior coxe less 
distant, with the portion of the first abdominal segment 
included between them pointed . . . . - + + + « » Microzoum, Redt. 
OPATRUM, Fabricius. (Hopatrum, auct.) 
This is a large and extensive genus, containing upwards of one hun- 
dred and fifty species, of which twenty-five are found in Europe, and 
the remainder are very widely distributed, species occurring in Siberia, 
Japan, Ceylon, Madagascar, the Cape of Good Hope, the Gaboon dis- 
trict, St. Helena, Java, the Australian region, &c.; it does not, how- 
ever, appear to be represented in North or South America; the species 
are scabrous and, for the most part, dull and obscure insects, and are 
found in sandy places, especially near the coast ; they appear to be 
variable in several points. 
The larva and pupa of O. sabulosum are described and figured by Schiodte (.c. 
pp. 541, 585, pl. vii. fig. 15, 20); they much resemble those of Crypticus, but are 
somewhat broader, and the plates at the sides of the pupa are less plainly dentate and 
set with shorter setze; the colour of the larva is fuscous above and pale beneath, 
with the mandibles and the apex of the claws pitchy. 
O. sabulosum, Gyll. Oblong-oval, dull black, rough, often en- 
crusted with sand and mud, not very convex; head transverse, much 
narrower than thorax, antenne short and stout, much thickened towards 
apex, with the penultimate joints transverse, maxillary palpi with the 
last joint securiform ; thorax transverse, with the sides slightly rounded, 
posterior angles projecting, very closely granulate ; scutellum rather 
large; elytra with irregular rows of strong tubercles placed more or 
less widely apart; interstices very closely granulate ; legs stout and 
robust, anterior tibie dilated, fossorial. L. 6-7 mm. 
Male with the first three segments of the abdomen slightly impressed 
in middle. 
Sandy places on the coast; locally common 3; Southend ; Whitstable ; Clacton- 
on-Sea; Hastings; Deal; Dover; Brighton ; Portsmouth district ; Isle of Wight, 
Sandown, &c.; Chesil Beach; Devon, general; Liverpool district ; it appears to be 
common all along the south-eastern and southern counties of England, but has not 
been recorded from Scotland or Ireland ; it is an extremely strong and stout insect, 
aud very tenacious of life. 
MICROZOUDI, Redtenbacher. 
The members of this genus considerably resemble the preceding, but 
are smaller and less roughly sculptured; they may be known from 
