1890.] M. Letliierry — Description of a new PsylUd. 165 



2. Novicice Indicce II. An additional sjjecies of Ellipaiithus. — By 

 D. Peain. (With a plate.) 



3. Bust and Mildew in India. — By A. Barclay, M. B., Bengal 

 Medical Service. 



These papers will be published in the Journal, Part II. 



4. Description of a new Psyllid. — By M. Lethiekrt. Communicated 

 hy E. T. Atkinson, Esq. 



In December last, Mr. R. C. Wroughton sent a Psyllid that was 

 found to be attended by ants of the genus Camponotvs (probably 

 C sylvaticiis, Olivier). He wrote that he found a tree simply covered 

 with these insects. " They were all along the midribs of the leaves 

 (beneath), and all over the young twigs, and the ants were also swarm- 

 ing over the tree. The eggs of the insect were fixed in clusters on each 

 side of the midrib, and were of a bright yellow." M. Lethierry has 

 kindly identified the insect as a new species of Biapliorina. — E. T. A. 



DiAPHORiNA GUTTULATA, Lethierry. 



Caput et thorax lutea ; vertex lutens, duabus raaculis rotundatis 

 fuscis ; sternum et dorsum rubescentia, dorsulum et mesonotum maculis 

 longitudinalibas fuscis ; abdomen flavescens, supra fasciis nigro-fuscis, 

 segmento genitali scepissime fusco : coni frontales subglobosi, 2/3 

 longitudinis verticis sequantes : autenufe latitudine verticis vix longiores, 

 flavescentes, articulis basalibus fuscis, duobus terminalibus nigris : 

 elytra 2| tarn longa quam lata, opaca, nigra, venis nigris, maculis 

 numerosis albis conspersa, margine postico cellularum sex apicalium 

 usque ad apicem clavi albo unimaculato : femora fusca, tibiis et tarsis 

 flavis vel albidis, harum ultimo articulo nigro. — Long corjDoris 2 millim. 

 cum elytris 3 millim. 6' 2 



Variat : elytris albis, subhyalinis, maculis numerosis opacis nigris, 

 venis nigris. 



B. Butoni, Low et propinquce, Low similis, major, elytris obscuriori- 

 bus, venis nigris distiucta. 



Hab. Poona, Bombay. 



5. 071 some Definite Integrals. — By Asdtosh Mdkhopadhyay, M. A., 

 F. R. A. S , F. R. S. E. 



(Abstract.) 



1. If two concentric ellipses of equal size and shape intersect each 

 other, their common chords intersect orthogonally at the common centre 

 and bisect the angles between the major axes of the ellipses. 



2. The area of the curvilinear quadrilateral common to the two 

 ellipses is 



1 (2ah 1 ) 



2ab tan < — -^— V 



i a'^ — b^ sin d ) 



