BY PROFESSOR T. THOMSON FLYNN, B SC. 71 



Rhopaloehynchus tenuissimus, Haswell. 



(PI. XVIII., figs. 1-3.) 



1884, Colossendeis tenuis><inia, Haswell, 1884, p. 1029, jol. 



56, figs. 5-8. 

 1893, Rhopalorhyndius; clari/'e-^, Carpenter, 1893, p. 24, 

 pi. II., figs. 1-10. 



1908, Rhopalorliynclnis tenuissimus, Loman, 1908, p. 24. 



1909, Ehovcdorliynciius tenuissimus, Tliompson, 1909, p. 

 533. 



SjJecimen. — Australian Museum Collection, G5195, 

 holotype, male. Port Denison, Queensland. 



Descri'ption. — It is only necessary to supplement 

 in a small degree Prof. Haswell's account of this species. 



Cepltalori is short and narro^v, not expanded in front. 

 SegTiientation is distinct. 



Ocular tuhercle is situated on the posterior portion of 

 the cephalon. It is cylindrical with a small rounded con© 

 at the apex. 



Abdomen is present, but as usual in this genus is quite 

 minute. 



Palps are ten jointed. The first joint is short and 

 thick and expanded at the extremity; the^ second is very 

 small; the third joint is very long and slender; the re- 

 maining joints are as described by Haswell. 



Ovigers. — The chara.cter of the spines of uhe last 

 few joints cannot be determined with accuracy as the 

 joints had not been cleaned before the specimen had been 

 mounted originally. The spines, however, seem to be long 

 and sharp and arranged in several rows. 

 Measurements : — 



mm. 



Proboscis, length 4.41 



maximum diameter 1.05 



Tnuik, length 5.28 



width behind first crurigers 29 



,, ,, second ,, 32 



width across ,, ,, 1.58 



Palp, first joint ... 12 



second ,, 07 



third ,, 2.92 



fourth , 19 



fifth 1.53 



sixth ,, 31 



seventh,, 38 



eighth ,, 42 



ninth ,, 40 



tenth 38 



