466 Mr. T. D. A. Cockevell on 



tliere are otlicr differences obvious upon close comparison. I 

 am not quite sure that we do well to accept the genus Erium 

 as distinct from DactyJopius (i. e. Pseudococcus, VVestw.) ; if 

 it is accepted it would seem that it ought to include also Irisin, 

 Steeli't, licJdenswides, and neomexlcanua. It is easy enough 

 to group together these species which have a complete sac, 

 but there remains a doubt whether they are as intimately 

 related as their superficial appearance would suggest. 

 E. Steelii (Ckll. & Towns.) was found by Townsend on May 3 

 at Ojo de San Diguela in Chihuahua. Its antennal joints 

 measured thus: (1) 42-45, (2) 40-45, (3) 36-42, (4) 21-27, 

 (5) 24-33, (6) 27, (7) 36-40, (8) 84-87. 



TakahashiajaUscensh, T. D. A. & W. P. Ckll., sp. n. 



? . — Ovisac pale yellowish, firm, standing straight out 

 from brancli, about 13 millim. long and 6 broad, with the 

 shrivelled female on the end. Female after boiling dark 

 brown (nearly clear after prolonged boiling), circular, about 

 6 millim. diam. ; margin with sharp spines as in Lichtensia, 

 about 30 jjb long and as far apart as the length of one ; skin 

 with numerous minute glands; anal plates ordinary, but 

 quite broad, about 240 |u, long ; legs strongly coloured ; 

 feraur + trochanter 315 /x, tibia 219, tarsus 132; claw about 

 45 fjb long, very large and very stout at base ; tarsal digitules 

 extremely fine, about 75 /x long, with minute knobs; claw- 

 digitules extending far beyond claw, as far as tarsal digitules, 

 very slender, with small knobs ; antennaj short, more or less 

 rudimentary, 5- to 7-jointed, length 210 /u, or more ; in the 5- 

 jointed form the last four joints measure in /x : (2) 30, (3) 51, 

 {A) 90, (5) 60; in the 6-jointed 4 is divided, and we have 

 (4) 42, (5) 30, (6) 60; in the 7-jointed 6 is divided. 



EmbryoniG larva with 6-jointed antenna?, the joints 

 measuring in /x : (1) ?, (2) 30, (3) 24, (4) 24, (5) 36, (6) 51. 

 The young are ochreous, with two broad longitudinal black 

 stripes ; the cephalic end is abruptly narrowed, and the black 

 stripes are replaced by mere lines; eyes black and conspicuous. 



Hah. Barranca de Atenquique, Jalisco, July 9, on " Copal." 

 The leaves of the plant are pinnate, with about eleven to 

 twelve pairs of leaflets. The plant is, perhaps, a lihas, as 

 suggested by Townsend. 



The discovery of Tukahashia in Mexico is very surprising ; 

 the genus has hitherto been represented by a single species 

 found in Japan. A new study of the genus shows that it is 

 derived from Lichtensia, not from Falvnian'a, as formerly 

 supposed. Exccretopus is also related to Lichtensia. 



