Tribolium. | HETEROMERA. 21 
last joints forming a club, terminal joint paler ; elytra with fine but dis- 
tinct punctured strie, interstices narrow, subcarinate, thickly punctured ; 
legs ferruginous. L. 3-4 mm. 
A cosmopolitan species; occurring in flour, &e.; often found in bakers’ shops ; 
occasionally it has been taken under the bark of old trees; common; London ; 
Sheerness; Dover; St. Peter’s, Kent; Hertford; Norfolk; Hastings; Hampshire ; 
Birmingham; Burton-on-Trent ; Scarborough ; Mauchester (abundant in cocoons 
of Crisula trifenestrata received from India for the Jubilee Exhibition, 1887, 
(Chappell) ); Liverpool; Northumberland and Durham district ; Scotland, Forth 
district. 
T. confusum, Duv. Very closely allied to the preceding, but 
rather larger and broader, with the sides of the thorax a little more 
rounded in front, and the anterior tibie less acutely produced on the 
outer side ; it may be easily known by having the antenne gradually 
thickened to apex, the last five or six joints being wider than the pre- 
ceding; the elytra have the punctured strie less evident, and the 
minute punctuation of the interstices less regular; legs red. L. 33- 
4+ mm. 
Of similar habits to the preceding, and often occurring with it, but not nearly as 
common; London; Hastings; Birmingham; Burton-on-Trent; Manchester; it 
probably occurs in many other localities. 
PALORUWS, Duval. 
This genus has been by many authors included under Hypophleus 
(Corticeus), but in structure and habitat is more closely related to T'rv- 
bolium ; from the former genus it may be distinguished by having the 
apex of the elytra rounded and covering, or almost entirely covering, the 
pygidium, and also by the eyes, which are smaller, rounded, and not 
kidney-shaped ; the antenne have the five last joints thickened ; the 
entire eyes will at once separate the genus from Z'riboliwm, in which 
genus they are strongly divided ; two species are found in Europe, one 
of which occurs in Britain. 
The larva and pupa of P. melinus, Herbst. (depressus, F.), are described and figured 
by Schiddte (pp. 561, 587, pl. x. figs. 12, 16); the larva is very like that of 7, ferru- 
gineum, except that the prothorax is shorter and somewhat transverse, and the apical 
segment is longer, with the pointed processes more minute; the colour, too, is paler 
ferruginous; it differs very much from that of Hypophleus (Corticeus) bicolor, which 
is much broader ; the pupa is narrower than that of Trzbolivm, and is set with longer 
setzo; the cerci, too, are shorter; the insect in all its stages is found in meal, 
bran, &e. 
P. melinus, Herbst. (depressus, F.). Elongate-oblong, parallel-sided, 
depressed, rather shining, rufo-testaceous ; head rather large, closely 
punctured ; thorax subquadrate, very gradually and slightly narrowed 
behind, distinctly and not very closely punctured ; scutellum transverse ; 
elytra with fine but distinct rows of punctures, interstices minutely 
punctured ; legs reddish-testaceous. L. 23 mm. 
