54 Contributions to the Entomology of South America, 



cordiform, but with tlie sides evenly rounded from the base to the 

 apex ; the elytra have the interstices of the striae not in the form of 

 simple smooth ridges as in G. vulgaris, but either distinctly punc- 

 tured or more generally rugose ; and lastly, the legs are consi- 

 derably shorter and stouter : the tibiae are very angular, and the 

 prominent angles are serrated. 



Psammetichus crassicornis. 

 Psam. niger ; capite thoraceque tuberculis minutis creberrime obsitis; 

 antennis percrassis : thorace dorse carina longitudinali, postice 

 abbreviata, instructo : elytris ovatis, valde rugosis, costatis, costis 

 denticulatis et rugosis. — Long. corp. 8| lin. ; lat. 3j lin. 



This species is about equal in size to, or perhaps generally rather 

 larger than, the Ps. costatus, from which it is readily distinguished 

 by the thickness of its antennae ; these organs are but little larger 

 than in the Ps. costatus, but in thickness their bulk is double 

 that of the antennae in the insect last mentioned. The legs are 

 rather stouter than in Ps. costatus (the tarsi distinctly so) ; the 

 head and thorax are covered in the same way with small tubercles, 

 but in the present species they are more minute and more crowded. 

 The costae on the elytra instead of being nearly simple ridges are 

 very rough and strongly notched, presenting a distinctly serrated 

 outline. 



Naupactus Bridgesii. 

 Naup. ater, squamulis viridi-argenteis ornatus; corpora elongate: 

 capite crebre punctulato postice rugose, supra, rostroque canali- 

 culatis : thorace rugose et punctate, vittis tribus viiidi-argenteo 

 squamesis : elytris punctate -striatis dense viridi-squamosis, sutura, 

 vittis duabus lengitudinalibus, marginibusque denudatis : corpora 

 subtus squamulis sordide albis adspersis : antennis pedibusque pilis 

 albis obsitis. — Long. corp. 7 lin. 



In general form this species most nearly resembles the Naupac- 

 tus rivulosus ; it is however considerably smaller than that insect. 

 The head and rostrum are finely but thickly punctured, and the 

 former is somewhat rugose behind ; both have scattered bluish 

 white scales : the thorax is rather broader than long, narrower in 

 front than behind, has the sides slightly rounded, and is some- 

 what constricted near the base, so that the posterior angles are 

 rather prominent and acute ; the posterior margin is indistinctly 

 waved, the surface uneven and rugose ; above are three longitu- 

 dinal broadish silvery green marks, and these are somewhat im- 

 pressed as it were. The elytra are scarcely broader than the thorax 

 at the base, thence to the middle the width is about equal, but 

 from the middle to the apex the width decreases ; the apex is 

 rounded ; they are punctate-striated, and the interstices are ob- 

 scurely rugulose ; the suture is raised and destitute of scales ; the 



