293 



9 Only one genns Neoberlesia Berl. 



i Legs 1 uornial Neopodocinum Oudms. 



( Legs 1 very long Podocinum Berl. 



23. Liponyssus musculi C. L. Koch. 



(With Plate VIII, fig. 19-22 and IX, flg. 23-26). 



Amongst 28 specimens, found by Mr. S. A. Poppb on Vespe- 

 rugo serotinus, there were 22 nymphae, 1 cf and 5 Q. 



I am in the opportinuty to correct soine of Berlese's statements, 

 as to the cT and Q. 



Nympha. Length 360—400 ^., when swollen 400—720 &. — 

 Colour white or pale. — Dorsal side (Fig. 19) protected by : 

 1. one anterior dorsal shield, subpentagonal, reaching the middle 

 of the dorsum, scaly, and bearing 10 pairs of hairs of nearly 

 equal length ; 2. one small posterior dorsal shield, subquadrau- 

 gular, scaly, and bearing 3 pairs of hairs of nearly equal length ; 

 and 3. four minute intermediate shields. The remaining of the 

 dorsum is finely wrinkled and provided with hairs of nearly 

 equal length. — Ventral side (Fig. 20). Remarkable are: a sub- 

 heptagonal, scaly sternal shield with 6 stifi hairs and a small 

 oval anal shield, with top turned backward and with cribrum. — 

 The peritrema (Fig. 19) is short and has sometimes the aspect 

 as if hauging with its two ends on the body like the handle of 

 a tea-cup. Epistoma (Fig. 21) a thin transparent blade with point 

 forward and denticulate edges of the distal half. — Mandibles 

 (Fig. 22) smooth, without teeth, and provided with a transparent 

 appendage. — Hypostoma (Fig. 23) with slender horns, provided 

 with a transparent appendage in top, pointed fused inner malae, 

 and 6 long fine hairs. — Coxa 2 with a little tubercle anteriorly. 



Male (Fig. 24). The scaly dorsal shield resembles that of the 

 females of Ij. sylviarum (Can. et Fanz.) and L. lacertarum (Cont.). 

 It corresponds with the two dorsal shields of the female. Berlese 

 describes it as »in partes duabus distinctissime divdso"! The 

 dorsum is provided with bristles, not with hairs. Ventrally (Fig. 



