NOTASPIS QUADBIOARINATA. 385 



dorsal. The pseudo-stigmatic organs are long, filiform, 

 rough, and sinuous. 



Legs rather short, of almost even thickness through- 

 out ; rough. There is a projecting point on each front 

 tibia, which bears a very strong, tactile hair ; most of 

 the other joints have a pair of short, curved, spatulate 

 hairs ; tarsi short and thick. 



Abdomen shield- shaped. The cast notogastral 

 skins are carried excentrically, all starting from the 

 progaster, but each lower skin extending further 

 backward than the skin above it. The notogaster is 

 somewhat raised along the median line, and slopes up 

 to it from both sides; otherwise the cast skins are 

 carried flat on the back, except that the edges of each 

 skin have curled, and form a bordering ridge to it. 

 Within the space enclosed by the inner ridge, i. e. upon 

 the larval skin, are three hemispherical knobs arranged 

 longitudinally ; and also in the same median line at the 

 posterior end of the creature, and of each cast skin, is 

 a less well-defined knob having two points posteriorly ; 

 each point bears a long, spatulate, curved hair. 



Distribution. — The species lives in dead wood ; I 

 first found it in some material sent to me from near 

 Leeds. I have since found it at Hopwas Wood near 

 Tamworth, and in other places. I am under the 

 impression that it is fairly generally distributed and 

 not uncommon, but it requires very careful searching 

 to find it. 



NoTASPis QUADBIOARINATA,* Michael. PI. XXXI, figs. 13 



—15. 



Notaspis quadricarinata, Michael. Journ. Roy. Micvosc. Soc, 



ser. ii, vol. v, p. 393, pi. vii. 



Average length about '2 mm. 

 Average breadth about "lo mm. 



* Quadrus, four-square ; carina, a keel. 



VOL. II. 25 



