1889,] 251 



in this they are fully as much as, or even more than, half the length (Fig. 3). 

 Taking all the differences iuto consideration, I think it must be allowed that this 

 form constitutes a species distinct from L. acuminatum. The species is also allied 

 to L. hesperidum, yet the possession of eight joints in the antennae not only separates 

 it from that, but also the other species associated by the possession of 7-jointed 

 antennae and agamic reproduction to form Signoret's 1st section of the genus. Not 

 to believe this would be to impute an inaccuracy of observation to Signoret that I 

 do not think is warranted ; the lamentable nature of the malady under which un- 

 happily he is suffering precludes a reference to him. L. acuminatum was obtained 

 by Signoret on orchids in the hothouses of the Luxembourg. — J. W. D.]- 



[The Lecanium on mango leaves from Demerara, mentioned at p. 152 ante as 

 L. acuminatum, proves to be L. mangifera ; the scales on the orchid were damaged 

 too much for examination. — J. W. D.]. 



DIAGNOSES OF UNCHAKACTERIZED SPECIES OF DlABROTICA. 



BY JOSEPH S. BALT, E.L.S. 



I. 



Antennis articulis duoibus brevibus,fere cequilongis. 



DlABROTICA GTJTTIEERA. 

 Anguste oblongo-ovata, postice ampliata, jlava, nitida, pectore, tibiis, 

 tarsis, scutello capiteque nigris, antennis basi sordide piceis, apice albidis, 

 thorace Icevi; elytris nigris, utrisque limbo laterali, postice abbreviato, niaculis 

 duabus infra basin, oblique transversim positis, und subapicalifascidqueprope 

 medium, utrinque abbreviatd, albidis aut Jlavo-albidis. Long., 'Z\ — 4 lin. 

 Sab. : Cayenne. 



DlABROTICA IlLIGERI. 



Anguste ovata, postice paullo ampliata, convexa, Jlava, nitida, pectore, 

 scutello capiteque nigris, facie plus minusve jlavd ; antennis basi piceo-fulvis 

 aut fulvis, articulis penultimis duobus albidis; tibiis, tarsis anoque piceis 

 aut nigro-piceis, thorace Icevi ; elytris nigris, utrisque limbo basali, margine 

 externo, maculis duabus infra basin, oblique transversim positis, fascid vix 

 pone medium utrinque abbreviatd, maculdque snbapicali, jlavo-albidis ; <?, 

 antennis quam corpore paullo longioribus ; $ , antennis quam corpore vix 

 brevioribus. Long., 3^ lin. 



Sab. : Amazons. 



DlABROTICA JAYETI. 



Anguste ovata, postice ampliata, convexa, nigra, nitida, femoribus (apice 

 extremo excepto) thoraceque flavo-fulvis ; antennarum articulis penultimis 

 duobus Jlavo-albidis ; thorace obsolete bifoveolato ; elytris tenuiter punctatis, 

 utrisque maculis duabus rotundatis, infra basin positis, fascid pone medium, 

 utrinque abbreviatd, maculdque rotundatd subapicali, albidis; $, antennis 

 ad corpore fere (Bquilongis ; ? , antennis quam corpore brevioribus. 



Long., 2>\ lin. 

 Sab. : Brazil. 



