(dr. a. c. oudemans). new list oe dutch acari, II. 37 

 41. Parasitus longulus (G. L. Koch). 

 (With Plate 4, fig. 7^2—79). 



Under the name of Gamasns coarctatm K. and Gamasus attenu- 

 atus Koch, Berlese has dehneated and described an Acarus (Ac. 

 Myr. Scorp. Ital. 63, 7), which, according to the Rules of Nomen- 

 clature must be called Purasltits longulus (C. L. Koch). The length 

 of the animal is given 750 i». for the male, and 850 [i. for the 

 female. My numerous specimens have these dimensions, but they 

 possess peculiarities which I think important enough to publicate 

 them. 



The females epistema (Fig. 7*2 — 74) differs slightly. In most 

 instances the middle spine is the longer, in a few instances the 

 lateral ones. I have not seen an epistema as Berlese draws. 



The malé'ü epistema is unvariably beautiful, somewhat crown- 

 like (Fig. 75). Its cornicula hypostomatis (Fig. 76 and 77) differ 

 somewhat from Berlese's figure. Its first article of the palpi has 

 only oiie tubercle (fig. 78), not two, as drawn by Berlese. This 

 tuberie is enormous, whilst the two of Berlese's figure are small. 

 Its second leg is much stronger tuberculated (Fig. 79) than that 

 of Berlese's type, even stronger than Berlese's variety minor 

 (Ac. Myr. Scorp. Ital. 63, 8). The femur has one great, spatulate 

 or thumblike apophysis , and one smaller one , also somewhat 

 thumblike. The genu has one fan-shaped tubercle which forms 

 pincers with the smaller one of the femur. There is still another 

 knob-like tubercle on the genu, which, assisted by a knob-like 

 tubercle of the tibia, forms pincers with the great spatulate apophysis 

 of the femur. 



The males show a very fine line between the anterior and 

 posterior dorsal shields ; the females don't have such a line , they 

 have only oiie dorsal shield. 



