On some CoccuVjh from Mexico. 465 



described certain features, and convinces me of the identity 

 ot the two species. The name tlierefore must stand as above. 

 The species has been found only rarely in Otago Harbour. 



Order COPEPODA. 



Family CalanidaB. 



Genus Guernea, Thomson. 



In 1895 I described and figured a new Copepod from 

 ]\Iacquarie Island as Guernea antarctica. In accordance 

 with a suggestion received from my friend Rev. T. R. R. 

 Stebbing, I propose the name Deguernea for the new genus, 

 as the former is already preoccupied. 



LXIII. — Some Coccid£e/rom Mexico. 

 By T. D. A. COCKERELL. 



The Coccldffi herein discussed were all collected in the 

 summer of 1902 by Professor C. H. Tyler Townsend, to 

 whom we have also in former years been greatly indebted for 

 additions to the Coccid fauna of Mexico*. 



Erium zapotlanum, sp. n. 



? . — Gregarious on the leaves, in loose globular snow- 

 white sacs, about 3 millim. diam., which adhere to anythino- 

 they touch. Boiled in KHO, turns crimson, but only slightly 

 stains the liquid; ? cleared and mounted about 1800 /i lono- 

 and 1000 broad. Anal ring with six bristles; dorsal surface 

 with small opines (about 18 /u, long) in rows, far apart; sides 

 with many minute glands ; ventral surface with fewer but 

 larger circular glands and a very few bristles ; labium di- 

 merous, about 100 [M long and 81 broad ; legs and antennae 

 pale, no denticle on inner side of claw ; antennas 7-jointed.-- 

 Measurements of legs and antennse in /a: — Femur + tro- 

 chanter 186; tibia 150; tarsus 69; claw 27. Antennal 

 joints: a) 30, (2) 30, (3) 33, (4) 27, (5) 25, (6) 27, (7) m. 

 Hah. Zapotlan, July 7, on " lluele de Noclie." 

 Allied to Erium erioyoni [DactyJopius eriogoni^ Ehrhorn) 

 from California, but the female is of a different colour, and 



* Including the species now reported, 161 Coccid;e are known from 

 Mexico. Of these, 90 have proved new to science, their discoverers 

 being, so far as known, as follows: — Townsend, 51; Koebele 2G • 

 Duges, 6 ; Cockerell, 3 ; Salle, 2 ; Llave, Herrera, Palmer, I each, ' ~ ^ 



