Tribolium.} HETEROMERA. 21 



last joints forming a club, terminal joint paler ; elytra with fine but dis- 

 tinct punctured striae, interstices narrow, subcarinate, thickly punctured ; 

 legs ferruginous. L. 3-4 mm. 



A cosmopolitan species ; occurring in flour, <fcc. ; often found in bakers' shops ; 

 occasionally it has been taken under the bark of old tree? ; common ; London ; 

 Sheerness; Dover; St. Peter's, Kent ; Hertford; Norfolk ; Hastings; Hampshire; 

 Birmingham ; Burton-on- Trent ; Scarborough ; Manchester (abundant in cocoons 

 of Crwtla 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, an,d the anterior tibiae less acutely produced on the 

 outer side ; it may be easily known by having the antennae gradually 

 thickened to apex, the last five or six joints being wider than the pre- 

 ceding; the ehtra have the punctured striae less evident, and the 

 minute punctuation of the interstices less regular; legs red. L. 3^- 



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. 



PAX.ORUS, DuvaL 



This genus has been by many authors included under Hypopldceus 

 (Corticeus), but in structure and habitat is more closely related to Tri- 

 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 antennae have the five last joints thickened ; the 

 entire eyes will at once separate the genus from Tribolium, in which 

 genus they are strongly divided ; two species are found in Europe, one 

 of which occurs in Britain. 



The larva and pnpa of P. melinvs, Herbst. (deprtssus, F.), are described and figured 

 by Schiodte (pp. 561, 587, pi. x. figs. 12, 16) ; the larva is very like that of T. fern- 

 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 ranch from that of Hypophlaeus (Corticevs) bicolor, which 

 is much broader ; the pupa is narrower than that of Tribolium, and is set with longer 

 setae ; the cerci, too, are shorter ; the insect in all its stages is found in meal, 

 bran, &c. 



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 ; scutefium transverse; 

 elytra with fine but distinct rows of punctures, interstices minutely 

 punctured ; 'legs reddish-testaceous. L. 2^ mm. 



