( 1-^1 ) 



side, wliieli in arhiUen is turned upwards in crescent shape, whereas it is feebly 

 curved in .S-shape in wolffsoluii. The ninth tergite is continued inwards for some 

 distance and here deeply excised, the lower lobe thus formed beinjr the manubrium ■ 

 of the clasper. The excision is wider in achillcs than in icolffsohni, the manubrium 

 (M) being likewise broader at its base and the dorsal internal portion of tlie segment 

 consequently smaller. The large flaj) (P') of the clasper is longer and narrower 

 than in wolffsohni, and the arrangement of its bristles is different. There is an apical 

 row of six bristles on this flap, then follow at the upper margin two more isolated 

 bristles, and finally a row of four. The tips of these bristles incline inward. On the 

 outer surface of the flap there are six short bristles. We do not find a homologon 

 of the stylet-like process observed above the flap in wolffmlnti . The two other 

 processes, however, marked P- and F in oar figure, are similar to the corresponding 

 processes of irol/fsolmi. The movalde process F bears a peculiar spine, which is 



Fig. 4. — Clasping organs of Cranfojmi/lla acliillcs (J. 



incrassate in the middle and ends in a sharp claw-like tip, the incrassate portion 

 being transversely excavate on the distal side, and somewhat twisted. Ventrally 

 to the clasper, the seventh sternite from inside, a slender and nearly straight 

 process projects on each side which is not present in ivolfsokni, and which we 

 believe to belong to the eighth sternite. The process bears two very thick spines 

 and near the apex a thin third sj)iue. 



Length : 2 mm. 



Ohota, Ecuador; taken o(f Ori/zomijs uUji<ji(lari!i by L. Siiderstrcim ; one S in 

 the British Museum. 



Craneopyslla ares spec. nov. 



?. Very near ('. m(ii:-< Uoths. (IS'.KS), from Tierra del Fuego. As only one 

 specimen each is known of laars and this new form, it is impossible to say if the 

 dift'erences mentioned below are geographical or specific. We expect them to be 

 geographical. Both mars and ares have a very remarkable receptaculum semini.s. 

 The head of the same is globular and separated from the tail by a deep constriction, 

 while the j)ortion of the tail nearest to the head is much swollen, and contrasts 

 sharply with the curved part of the tail. 



