516 Mr. D. Sharp and Mr. F. Muir on the Comparative 
Family TROGOSITIDAE (or Ostomidae, or Temno- 
chilidae). 
Forms examined: TZemmnochila virescens Fabr., Mexico. 
Alindria grandis Serv., Africa. Leperina, sp. n.? aff. 
adustae Pase., Australia. Thymalus limbatus Fabr., 
Brockenhurst. 
Figs. 89 and 90 Pls. LVI and LVII. 
Temnochila virescens (Pl. LVI figs. 89, 89a). 
Median lobe long, flattened laterally, formed by a trough-shaped 
chitin plate (a) on ventral aspectand membrane on dorsal aspect (b), 
with a chitin strut round median orifice at distal end (c). Tegmen 
formed into a sheath ; lateral lobes distinct and only amalgamated at 
base ; basal-piece large and tubular, chitinous on dorsal and ventral 
aspects, membranous on sides. Internal sac undifferentiated. 
Alindria grandis is of the same type, but the division between 
lateral lobes and the basal-piece is obliterated. 
Thymalus limbatus (Pl. LVII figs. 90, 90a). 
Median lobe long, straight, flattened laterally. Tegmen forming 
a sheath with lateral lobes consolidated together on the ventral aspect, 
basal-piece long, tubular, with a strong strut on the dorsal aspect 
at base (a). 
Leperina aff. adustae is of the same type but has the lateral lobes 
free. 
It is possible that this type is a development of a trilobe 
type through such a form as Awlonium. Byturus belongs 
near this family. 
Family COLYDIIDAE. 
Forms examined: Hnarsus bakewelli Pase., New Zealand. 
Tarphiomimus indentatus Woll., New Zealand. Auloniwm 
bidentatum Fabr., Guatemala. Deretaphrus ignavus Pasc., 
Australia. Cerylon histeroides Fabr., England. 
Figs. 91-95 of Pl. LVII relate to the above-named 
forms. 
Enarsus bakewelli (Pl. LVII figs. 92, 92a, 920). 
Median lobe nearly as long as tegmen, chitinous on dorsal and 
lateral aspects, membranous on ventral (a); median orifice on ventral 
aspect near apex. ‘Tegmen consists of a large basal-piece formed of a 
ventrally-placed sclerite, the dorsal aspect membranous, and a pair of 
