1857.] Entomological Papers. 147 



50. Oosoma Qerstcsclceri. N. 



O. supra brunneo-aenea, ssepius glaucescens, elytris dorso dilute 

 brunnescentibus maculis 4 longitud. irregularibus flavis pictis, sub- 

 tus magis lninusve brunnea, pedibus, antennis labroque testaceo- 

 brunneis, palpis antennarumque basi testaceis ; long. corp. 2£ lin. 

 lat. 1\ lin. 



Excepting in colour not essentially differing from the former. 

 However, the marks of the thorax are more distinct, and the 4 

 obsolete pits are replaced by 2 longitud. impressions, the whole 

 insect is, moreover, more graceful than the former. The maculae 

 of the elytra may be said to commence at the basal angles of the 

 thorax which are of a similar, but less distinct, colour. The true 

 humeral maculae begin at the base of the elytra and stretch nearly 

 to the middle as a thick straight line of narrow parallelogram the 

 principal part of which occupies the 6th interstice a spot being 

 thrown out on either side. The apical maculae commence a little 

 below the middle and are essentially composed of small squares 

 heaped upon each other so as to form steps or an inverted pyramid. 



As this design varies more or less in different individuals it can 

 be of no importance to describe it in a more detailed manner, suffice 

 it to say that apparently in no instance does any part of it reach 

 either the inner or outer margin, the field upon which it is displayed 

 being enclosed by the 1st and 7th stria. The brownish green 

 metallic upper surface of the insect in some individuals throws off 

 a fine blue reflex, very perceptible on head and thorax. The part 

 of the back enclosed by the maculae is washed out to a light brown 

 with the exception of the suture which remains dark. 



In naming this pretty species after Dr. Grerstaecker of the E. 

 Museum, Berlin, I wished to pay that gentleman the only trifling 

 compliment circumstances admit of in acknowledgment for various 

 useful hints he has kindly communicated to me. 



51. Chlcdnius princeps. N. 



C. aureo-viridis, scutello cupreo, elytris nigro-viridibus ad basin 

 -et infra marginem viridibus, sutura nigra, subtus piceus, coxis 

 trochanteribusque 4 ant. dilutioribus, femoribus trochanteribusque 

 2 post, testaceis, tibiis tarsisque obscurioribus, ore antenuisque 



u 2 



