Malacoderm Genera Prionocerus and Idgia. 331 
: 2. Idgia dimidiata. 
Prionocerus dimidiatus, Gerst. Arch. fiir Naturg. xxxvii. p. 56 (1871) '; 
Von der Decken’s Reise in Ost-Afrika, iil, 2, p. 158, t. 8. fig. 11 
(18738) *. 
Elongate, depressed, slightly widened posteriorly ; thickly 
pubescent, the elytra also with scattered, long, seriately 
arranged, erect black sete, the head and prothorax with 
numerous curled black bristly hairs, those behind the eyes 
projecting laterally ; black, the prothorax and scutellum, 
and the elytra with from one-fourth to nearly one-half 
their length, fulvous or luteous, the apical patch often with 
a bluish or violaceous lustre. Head polished, with a few 
small scattered punctures, the labrum large, transverse, 
angularly dilated laterally ; eyes very large in ¢, a little 
smaller in 9, well separated in both sexes; antennez 
moderately long in ¢, shorterin 9 , joints 38-11 longer than 
broad, widened, subserrate, 7-10 decreasing in length, 
11 much longer than 10, concave on its inner face. Pro- 
thorax as long as broad, sparsely punctured. Hlytra long, 
densely granulato-punctate, the seriately arranged setigerous 
impressions each preceded by a minute tubercle, the apices 
obtuse, in some specimens angulate at the sutural angle. 
g. Anterior tarsal joints 1-3 with a comb along their 
inner edge, 1 simple, scarcely longer than 2, 4.small, shorter 
and narrower than 3 ; joint 1 of intermediate and posterior 
tarsi simple, slightly longer than 2; posterior tibiz feebly 
curved. Genital armature (Pl, XI. fig. 4): lateral lobes long, 
broad, rounded or obtuse at tip ; median lobe gradually 
narrowed, drawn out into a very long, slender, curved, 
somewhat sinuate point at apex. 
Length (excl. head) 93-133, breadth 33-5 mm. (¢ ?.) 
Hab. Axsyssinta, Higo Samula (R. J. Stordy) ; E. Arrica, 
Mombasa’ [type], Masongaleni (alt. 3000 ft.), Kibwezi 
(alt. 8000 ft.), M:gori Valley in 8. Kavirondo (alt. 4200 ft.), 
Mtito Andei (alt. 2500 ft.), Makindu (alt. 3300 ft.), Voi 
(alt. 1800 ft.), Usangu district (alt. 8500-4500 ft.) (S. A. 
Neave), Lulanguru (G. D. H. Carpenter), Samburu (C. 8. 
Betton) ; Nyasatanp, Masai (Mus. Brit.), Mombera district 
(ait. 4000 ft.), Lilongwe district in Central Angoniland 
(alt. 4000-5000 ft.) (S. 4. Neave); N.E, Ruopxsta, on 
road Fort Jameson—Lundazi (alt. 4000 ft.), Upper Luangwa 
River (S. A. Neave) ; Masnonatanp, Salisbury (G. A. K, 
Marshall); Zu.vutann (Mus. Brit.) ; Narau (Mus. Brit.), 
Greytown (H. B. Marley), Estcourt (G. A. K. Marshall), 
Port Natal (Boheman*); ?'S. Arrica, Cape of Good Hope 
(Mus. Brit.). 
