224 (October. 



the sutural and outer striae with conspicuous oblong punctures, the others 

 finely punctate, the interstices flat, 2 very broad, all very sparsely minutely 

 punctate. Beneath sparsely, tinely, the metasternum very coarsely, punctate, 

 the prosternum grooved down the middle, roughened on each of this, and 

 almost smooth between the coxae ; intercoxal portion of the metasternum very 

 broad, simple. Femora each with two transversely placed teeth. Tibiae 

 rounded externally. 



Length 6, breadth 3^ mm. 



Hah. : Costa Rica, Juan A''inas, alt. 3300 ft. (P. P. Calvert, 

 26.iv.'10). 



Described from one of several specimens captured by Dr. Calvert. 

 D. tromeliartim is related to various Tropical American forms included 

 b}^ Schonherr under bis genus Centrinus, and by myself, tmder Dia- 

 sfethus Pasc, Its nearest ally is Centrinus lucens (Germ.) ( = micans 

 Bob.), from Brazil, from wbich it may be separated by its depressed 

 form, brassy-green colour, uneven elytra, more sballowly grooved pro- 

 sternum, very coarsely punctured metasternum, etc. The only recorded 

 Central American species approaching D. hromeliarum is D. violaceiis 

 Champ., which has dense patches of white scales on the under surface, 

 much as in the type of Diastethus, Centrinus tumidus Boh., this latter 

 having the metasternum tumid between the coxae. 



Aug. Brd, 1917. 



THE LAEVAE OF RHADINOCEBAEA MICANS Klug AND OP 

 PHYMATOCEBA ATEBBIMA Klttg. 



by t. a. chapman, m.d., f.z.s. 



(Plates V-YII.) 



My interest in Phymatocera aterrima, aroused by Mr. Morice's 

 account of it to the Entomological Society (Presidential Address, 1912), 

 induced me to examine its method of egg-laying (Ent. Eecord, 1915, 

 vol. xvii, jj. 145). In consequence, I Avas led to a desire to know some- 

 thing of IRJiadinoceraea miqans Kl. (Monophadmis iridis Kalt.), when 

 Mr. Champion told me of a sawfly, vinidentified at first, appearing com- 

 monly at Woking amongst Iris ^^sendacori/s, and on receiving specimens 

 I was able to identify it. Its interest in connection with P. aterrima 

 is in its extremely close resemblance to that species. Amongst the 

 Blennocampids there are several black species, but these appear to be 

 the most so, P. aterrima has, indeed, paler front tibiae, but P. micans 

 is entirely black ; both are practically glabrous, micans is really almost 

 so ; aterrima has some hairs, especially on the antennae. 



Mr. Morice, who first noticed P. micans as British in 1907 (Ent. 

 Mo. Mag. vol. xliii, p. 79), visited Mr. Champion's locality in due season 



