54 Transactions of the South African Philosophical Society. 



Ent. Soc. L. 1887, p. 323) associates with them not only Synthocns, 

 but also several of his own genera, namely, Daulaxius {= Synthocus), 

 Ixodicus {= Brotheus, Steph.), Euryxena and Dyerocera, all of which, 

 however, must be excluded because the mentum fills the entire buccal 

 cavity. The genus Dyerocera is very closely allied to Brachycerus, 

 from which the remaining genera differ in possessing a deep pro- 

 sternal furrow. Of the other genera included by Pascoe in his 

 revision, Liasotus, Pasc, proves to be synonymous with Hoplito- 

 trachelus, Schh., while his two genera, Ophryodotus and Pezerpes, 

 must be referred to the Ehytirrhininse. To this group also 

 belongs the genus Ithyphallus, Har. (= Stenotarstcs, Schh., 

 nom. praeocc), which Lacordaire placed in his Ehyparosomides ; 

 but in that group the tarsi are spongy beneath and have the third 

 joint broadly lobate, which characters do not occur in Ithyphallus. 



The Ehytirrhininse, as thus constituted, form a group sufficiently 

 homogeneous in character, and may be distinguished from the 

 Byrsopinae proper as follows : — 



Prosternal epimera not uniting behind the anterior coxae, but separated by a free 

 intercoxal piece ; scrobes rapidly deflected and passing obliquely much below the 

 eye Byrsopinae. 



Prosternal epimera uniting behind the coxge, and more or less completely fused 

 together ; scrobes straight and continued broadly right up to the eye. 



Eh YTIRRHININiE . 



The Byrsopinas, as thus restricted, comprise only two genera, 

 which present the following differences : — 



Kostrum with an acute angular carinate emargination in the middle of the apex, 

 the apical external angles not produced ; prothorax with a lateral spine, its dorsal 

 apical lobe more or less strongly emarginate ; the second abdominal segment almost 

 as long as the third and fourth together. 



Hoplitotrachelus, Schonh. (type, H. spinifer, rS,hr.) 



Kostrum with the entire apical margin reflexed, more or less roundly sinuate in the 

 middle, and with the external angles very prominent ; prothorax unarmed laterally, 

 its dorsal apical lobe simply rounded ; the three intermediate segments of the 

 abdomen subequal in length . . . . Byrsops, Schonh. (type B. buccellaria, Gyl.) 



HOPLITOTRACHELUS, Schh., 

 Mant. sec. p. 47 (1847). 

 Liasotus, Pasc, Trans. Ent. Soc. L., 1887, p. 335. 



Head with prominent superciliary ridges ; eyes depressed, almost 

 semicircular in shape. Rostrum stout, much shorter than the 

 prothorax, broadest at apex, shallowly constricted at base ; apical 

 margin with an angular carinate emargination in middle ; mandibles 



