OF SOME RHODESTAN TENEBRIONlU^.. 91 



t'osaorial ; anterior tarsi without projection on outer mar<^in. 

 Spines on inner niaroin oE anterior legs : — 



Tarsal claw 1, short aud bluut, or more prouiineiit. 



Tibia usually 2 (in one case 4), moderately 



prominent 

 Femur aud trochanter . . numerous, short, flat, and generally uuich 

 fused together. 



Dorsal surface of anal segment concave in profile; well- 

 ilex eloped ridge bearing cliitinous processes extending round 

 posterior and latero-posterior margin ; processes in form ot" 

 short spines; terminal pair more strongly developed and 

 fused together at base. A secondary armament of slender 

 bristles extends round the same region below the spine- 

 l)earing ridge. Pseudopodia prominent and armed with 

 spines, a rounded prominence bearing spines anterior to 

 l)seudopodium on either side. 



Notp:. The larva of a species from Umtali determined by 

 Dv. Pcringuey as T. griseus, Fhs., is very similar to that 

 of T. geniculatus. Owing to the faulty preservation of 

 this larva, however, accurate comparison is not possible. 



The food habits of the larvae are similar to those of 

 Psam modes, and at least two species are even worse pests of 

 tobacco. There is also reason to believe that these larvse 

 cause a mechanically-induced scab of potatoes by nibbling 

 the tubers during growth. 



Life-history. — The cycle generally occupies one year, but 

 it is probable that occasional specimens may occupy two years 

 in development. Unlike the other genera dealt with in this 

 paper the adult beetles emerge in April, at the end of the 

 rains. The ova are laid immediately and the larvse feed up 

 during both winter and summer. 



This genus is very common on both the sand veld and the 

 diorite. 



(5) Anomalipus. — Species studied determined as A. 

 plebeius, Pdring, (Plate IV. fig. 9; Plate V. 

 fig. 9). 

 Ociim. — Dimensions 4-25 mm. by 2*25 mm. Shining 

 white; form nearly cylindrical : abruptly rounded at ends. 



