345 



2. Dorsum tuberculate . tenebrarum Verhoeff . 



2. Dorsum not tuberculate gachassini (Giard), 



3. Dorsum tuberculate bureschi Verhoeff. 



inferus Verhoeff, pygmaeus Sars, 

 sorrentinus Verhoeff, 



3. Dorsum not tuberculate alemannicus Verhoeff, 



biformatus Racovitza, caelebs Verhoeff, 



caroli Verhoeff, corcyraeus Verhoeff, 



demivirgo Blake, elisabethae Herold, 



Jragilis Racovitza, maritimus Verhoeff, 



muscivagus Verhoeff, nivatus Verhoeff, 



noricus Verhoeff, omblae Verhoeff, 



plitvicensis Verhoeff, provisorius Racovitza, 



rhenanus Grave, riparius Dahl, simplicifrons 



Verhoeff, sulcatus Verhoeff, verhoeffi Dahl. 



The genus Miktoniscus Kessely^k (1930) removes from Tri- 

 choniscus the species characterized by the presence of monocellate 

 eyes, tuberculate dorsum and one and two penicils respectively 

 on right and left mandibles. It is further distinguished by 

 peculiarities of the seventh pereiopods and first two pairs , of 

 pleopods in the male. I extend it here to include, besides the 

 genotype M. linearis (Patience) and the new M. halophilus, also 

 M. chavesi (Dollfus), comb, nov., which is doubtfully distinct 

 from linearis. It is probable that Trichoniscus thielei Verhoeff 

 belongs here. 



Miktoniscus halophilus, sp. nov. 



Fig. 1, i~j; Fig. 2, a-i. 



Trichoniscus halophilus Blake (1930, p. 279), nomen nudum. 



Description. — The female, when alive, is salmon colored. This color fades 

 out after death, leaving a yellowish, cutaneous pigment. The pereion has two 

 submedian bands of white spots (fenestrae in the pigmentation). The surface 

 of the head and pereion is thickly, but irregularly, beset with acute tubercles. 

 The first three pleon segments bear each a row of tubercles. Length of body, 

 4.5-4.7 mm. 



The eyes are densely black, each provided with a single large lens. The 

 antennal lobe is large and seen from the side, semicircular. 



The tip of the telson is truncate and without spines. The terminal margin 

 may be either slightly concave or convex. 



The appendages show nothing of especial note. Pleopods I-III and V are 

 shown in Fig. 2, f-i. The scales on the lateral portion of pleopod I are blunt 

 ended. 



