JAMES A. G. REHN 



271 



Paurotarsus insolitus new species (Plate XV, figs. 36, 37 and 38.) 



Allied to P. amazonus Hancock, but differing in the more pro- 

 tuberant frontal costa, in the more angulate cephalic margin of 

 the pronotal disk, in the decided interhumeral depression of the 

 median carina, in the distinctly beaded character of all the 

 carinae on the dorsum of the pronotum, in the more elongate and 

 more slender caudal femora and in the relatively much shorter 

 caudal metatarsus, which latter is not a third longer than the 

 distal tarsal joint instead of at least twice as long as the same. 

 The disparity in length of the two joints is not wholly due to a 

 reduction in size of the metatarsus, but instead is caused as much 

 by the increase in size of the distal joint, which is actually much 

 larger and more robust than in amazonus. No close relationship 

 exists to P. rugosus Bruner, from Trinidad, with which insolitus 

 has been compared. 



Type. — 9 ; Madeira-Mamore Railroad Camp 43, Rio Madeira, 

 Brazil. (Mann and Baker.) [Acad. Nat. 8ci. Phila., type no. 

 5277.] 



Size very similar to that of P. amazonus; form similar. Head with the occi- 

 put rounded and arcuateh^ passing into the distinctly arcuate-protuberant 

 frontal costa, which is sinuate impressed at the median ocellus when seen from 

 the side; frontal costa when viewed from the cephalic aspect with the diverging 

 rami thick and the intervening sulcus relatively narrow, much as in P. amazonus: 

 eyes moderately protuberant, semiglobose, in depth but little more than half 

 that of the infra-ocular portion of the genae : antennae very slender, in length 

 when extended caudad slightly surpassing the humeral angle of the pronotum. 

 Pronotum caudate, surpassing the apices of the caudal femora by more than 

 the greatest ventral width across the pronotal lobes, in general form similar to 

 that of amazonus with the following exceptions: cephalic margin decidedly 

 obtuse-angulate instead of subtruncate-angulate; sculpture rougher with more 

 pronounced impressions and more elevated asperities; all carinae distinctly and 

 rather coarsely beaded instead of subglabrous and faintly beaded as in ama- 

 zonus; median carina of the pronotum faintty lower at the highest point than 

 in amazonus and distinctly depressed and subobsolete in the inter-humeral 

 region. Tegmina slightly narrower than in amazonus. Wings not quite 

 reaching the distal extremity of the pronotum. Ovipositor slightly more 

 slender and with blunter teeth than in amazonus. Cephalic and median limbs 

 have the distal tarsal joint relatively longer than in amazonus. Caudal femora 

 more elongate and more slender than in amazonus, the greatest width contained 

 three times in the length instead of two and two-thirds times as in amazonus; 

 dorsal and ventral femoral margins straighter: caudal tibiae more elongate: 

 caudal metatarsi but slightly surpassing in length that of the second and third 

 tarsal joints combined, the depth in consequence relatively greater and the 

 pulvilli individually shorter. 



TRANS. AM. ENT. SOC, XLII. 



