no. 1954. NEW ISOPODS FROM COSTA RICA— RICHARDSON. 339 



abdominal segment. The branches are styliform, the inner being 

 the shorter and about equal in length to the terminal abdominal 

 segment; the outer branch is about one and a third times as long 

 as the inner. 



About 1 1 specimens were collected at Estrella, at an altitude of 

 2,000 meters, by Mr. Picado. 



Locality 7. — One specimen at La Mica, in the mountains south- 

 west of Orose\ Collected by Mr. Picado. 



Locality 2. — Fourteen specimens at La Estrella, in the Bromelias, 

 several meters from the ground. Collected by Mr. Picado. 



Locality 6. — About 16 specimens at La Mica, in the mountains 

 southwest of Orose. Collected by Mr. Picado. 



Locality 4- — About 30 specimens at Pitahaya (south of Cartago). 

 Collected by Mr. Picado. 



In color and color markings the new species is similar to Porcelr 

 lionides pruinosus (Brandt). 



Type.— Cat. No. 43771. U.S.N.M. 



PHILOSCIA MUSCORUM (Scopoli). 



Locality 3. — La Pitahaya (south of Cartago). (Color pattern 

 typical.) Collected by Mr. Picado. 



Locality 1. — La Estrella, in Bromelias, several meters from the 

 ground. Collected by Mr. Picado. The color pattern is somewhat 

 different in these specimens, there being a double series of light 

 patches on each side of the mesosome, one series at the base of the 

 side plates and the other on the outer side of the series of dark patches. 

 The median dark band also has light patches. 



Locality 5. — La Mica, mountains southwest of Orose. (About the 

 same as No. 1.) Collected by Mr. Picado. 



Locality 6. — La Mica, mountains southwest of Orose*. The dark 

 patches are almost entirely obliterated by the presence of the light 

 patches. Collected by Mr. Picado. 



Locality 2. — (Same as locality 1.) In some specimens the color 

 pattern is the same as No. 1 ; in others the same as No. 6. Collected 

 by Mr. Picado. 



Locality. — Reventado. Collected by Mr. Tristan. In some speci- 

 mens the color pattern is the same as No. 1 ; in others it is the same 

 as No. 6; in others it is like No. 1, but with a transverse row of light 

 spots on the posterior margin of each of the thoracic segments. 



In some of the smaller specimens the first article of the flagellum 

 of the second antennas is not much longer than either of the other 

 two articles. 



In the male specimens the first two pairs of legs have the propodus 

 somewhat more inflated than in the specimens of Philoscia muscorum 

 from North America with which I have compared them. 



