Heteropteroiis Hemi'ptera. 33 



lateral margins and on the collar Avhich is distinctly c. nvex and 

 raised above the level of the calli, the disk Avith a median keel 

 running from between the calli backwards and becoming very tine 

 or evanescent toward the base, the lateral margins almost straight, 

 narrowly depressed and a little reflexed, distinctly angularly in- 

 dented at the ends of tlie transverse impression posteriorly termi- 

 nating the collar. Scutellum scarcely punctate. Hemelytra passing 

 apex of abdomen, corium and clavus thickly and very finely punc- 

 tured, their sericeous pubescence rather indistinct owing to its 

 •extreme shortness, membrane dull. Pleurae very finely rugulose 

 -and thinly sericeous. Abdomen beneath almost impunctate, rather 

 shortly and thinly pilose; second male genital segment with its 

 njedian part obliquely ascending without impressions, apical margin 

 bisinuate, apical angles subconically produced obliquely backwards, 

 distinctly divergent, the three appendages protruding from the 

 interior of the segment pale testaceous, the middle one shaped as \n 

 L. mitellatus, the lateral ones viewed from beneath parallel, viewid 

 obliquely from below with a small tubercle near the outer margin 

 beyond its middle, the space between the tubercle and the apex 

 curved with the convexity upward. Length (excl. membrane), 

 (? 8— 9 mm., ? 9— 10 nmi. 



Bagot's Creek ; near Glen Helen, Macdonnell Range ; near I)al- 

 housie Springs. Illaniurta, James Range. 



Allied to the preceding species, but readily distinguished, apart 

 from the smaller size and quite different colouring, by more dis- 

 tinctly punctured upper side, narrower and more raised anteocular 

 ridges, more distinctly depressed and reflexed pronotal lateral 

 margins with their distinct subapical indentation, more raised and 

 •convex pronotal collar, shorter and paler pilosity on the pronotal 

 lateral margins and collar, less distinctly sericeous corium, shorter 

 ventral pilosity, and differently constructed second male genital 

 segment. It was apparently the commonest of the Heteroptera met 

 with during the Horn expedition ; very numerous specimens wore 

 collected, especially near Glen Helen. 



Fam. MYODOCHIDAE. 

 22. Spilostethus pacificus, Boisd. 

 Ayer's Rock^^on WaJilenhergia gracilis. 



23. Spilostrthus mactans, Htal. 

 Dalhouse Springs. * 



