573 



Hummeln und Trigonen nehmen mit Ausnahme des ersten Segments 

 alle übrigen Segmente an der Wachsabscheidung teil; die Drüsen des 

 2. Segments sind bei den Trigonen fast in gleichem Grade wie die an 

 den übrigen Segmenten , bei den Hummeln weniger kräftig ausgebildet 

 und kommen bei den Meliponen wohl nur noch wenig für die Wachs- 

 abscheidung in Betracht. 



Bei Mehponen und Honigbienen sind endlich die Wachsdrüsen noch 

 in zwei, durch gewöhnliche Hypodermiszellen getrennte Felder zerlegt, 

 deren Abgrenzung bei den Bienen, unsern vollkommensten Wachs- 

 fabrikanten, am schärfsten durchgeführt ist. 



3. A New Psolus from Monterey Bay, California. 



By Walter K. Fisher, Acting Instructor in Zoologj', Stanford University, Calif. 



(With 13 Figures.) 



eingeg. 3. November 1905. 



The animal described below was taken by a Chinese fisherman on 

 a cod line, presumably from rocky bottom, at a depth that almost cer- 

 tainly did not exceed 120 metres. The fishing banks are off the south 

 end of the bay, one at the mouth, the others somewhat farther out. The 

 specimen was secured by Mr. M. H. Spaulding of the Zoology De- 

 partment, and he has kindly placed it at my disposal for description. 

 This type is deposited in the Zoological Museum of the University. 



Psolus californicus, new species. 



Diagnosis. — Tentacles 10, dendritic; dorsum covered with heavy, 

 imbricated scales devoid of granules, the free edges being prominent; 

 spaces between scales filled with numerous minute plates immersed in 

 membrane; area between oral and anal protuberances occupied by about 

 8 plates in 2 rows. Anal and oral prolongations only slight. Pedicels, 

 in 3 complete longitudinal series; those of the lateral ambulacra in 

 about 5 or 6 rows; those of middle ambulacrum in 2 rows, becoming 3 at 

 either end. Deposits — in ventral perisome are subcircular, elliptical, or 

 slightly irregular perforated plates with relatively few knobby protuber- 

 ances on the surfaces, and with more or less regularly incised edges, 

 together with similar, often slightly larger, fenestrated plates with 

 numerous rather irregular knobs and subcircular j)erf orations ; in pedi- 

 cels, larger, perforated circular, terminal plates and small, perforated, 

 elongate plates; in tentacles large and small, usually elongate, often cur- 

 ved, smooth, perforated, plates and rods ; in perisome surrounding base 

 of tentacles smaller irregular perforated plates and rods. Color in life, 

 brick red ; tentacles, bright vermilion. , . 



