654 MISCELLANEA ENTOMOLOGICA, NO. V. 



anterior sometimes denticulate on the external edge and with one 

 or two spurs, the four posterior tibiae with two spurs. Metas- 

 ternum very short. Mesosternum and prosternal process as in 

 Helceus. Body oval, apterous. 



This genus includes all the apterous species of the Heleides 

 excepting those comprised in the two preceding genera. They 

 seem to be all ground beetles, and inhabit chiefly the dry arid 

 districts of South Australia, Western Australia, and the interior 

 of New South Wales. A variety of different forms and sculp- 

 ture is to be found included under this genus, some perhaps justi- 

 fying the formation of new genera. I shall, however, content 

 myself with dividing the numerous species into sections, so as to 

 simplify to the student the identification of those described. 



I divide the genus in the first instance into three sections founded 

 on the sculpture of the elytra, viz. : (i.) Those species which 

 have distinctly costate el}'tra. (ii.) Those with a more or less 

 coarse reticulate sculpture, and (iii.) Those with the elytra not or 

 faintly costate, or punctate or smooth. The first of these sections 

 comprises three distinct types — (1) Hekeus, like insects of oblong 

 form, broad concave margins to thorax and elytra, and one costa 

 on each elytron. This includes four .species — S. incisus, Pascoe ; 

 S. convexicollis, Macl. ; S. Blackhurni, Macl., and S. Spinolce, 

 Hope. (2) Insects of the type of S. Icevicollis, Fab., — convex 

 form and tricostate elytra, the interstices tuberculate ; all the 

 species of this type have the apex of the anterior tibije largely 

 and bluntly pi'oduced, and the external terminal spine very large 

 and obtuse ; the group will include — aS'. Odewahnii, Pascoe ; *S. 

 catenulatus, Macl. ; 8. rudis, Macl. ; S. levicostatus, Macl. ; S. 

 rugosus, Boisd. (3) Species of the 8. emarginatus type. The 

 elytra costate as in the last, but the interstices smooth or only 

 punctate. Species — aS". einarginatus , Guer. ; S. iriterruj^tus, Breme ; 

 iS. marginellus, Hope ; 8. confirmatus, Pascoe; 8. opacipennis, 

 Macl. ; S. infelix, Pascoe. Section ii. Elytra reticulate, includes 

 five species — 8. luridus, Haag-Rut. ; 8. reticulatus, Haag-Rut ; -S". 

 clathratus, Macl. ; 8. crenulatus, Macl. ; 8. rugosij)ennis, Macl. 

 Section iii. like section i. is divisible into three groups. (1) 



