6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60. 



where brown, the half adjacent to the middorsal strip in each side 

 paler than the ectal half. 



Localities. — Honduras: La Ceiba (tj'pe locality), nine specimens, 

 and San Juan Pueblo, one specimen (W. M. Mann), 



Type.— Cot. No. 813, U.S.N.M. 



7. PLATTDESMUS POLYDESMOIDES Lucas. 



Platydesmus polydesmoides Ltjcas, Ann. Soc. Ent. France, 1843, p. 52, pi. 

 3, figs. 1-8.— PococK, Biol. Centr.-Amer., Diplop, 1903, p. 48. 



Locality. — Guatemala, 



8. PLATTDESMUS GUATEMALAE Brolemaim. 



Platydesmus gueitemalae Bbolemann, Mem. Soc. Zool. France, 1909, vol. 

 13, p. 112, pi. 7, Sgs. 78-82. 



Locality. — Guatemala. 



9. PLATYDESMUS LANKESTERI Brolemann. 



Platydesmus lankeateri Bbolemann, Ann. Soc. Ent. France, 1905, p. 354, 

 pi. 9, fig. 15. 



Locality. — Costa Rica: El Eeventado. 



DESMETHUS, new genus. 



This genus differs from Platydesmus in that the tergites bear 

 numerous closely arranged and setigerous tubercles over the entire 

 surface instead of bearing only two rows of these, but the tergites 

 each with a similar deep transverse furrow. It also differs in the last 

 tergite, which does not surpass the valves and does not bear the 

 caudal series of long setiferous cones, these being replaced by more 

 ordinary tubercles. Sternites, broad. Eyes, none. 



Genotype — DesTriethus setifer., new species. 



10. DESMETHUS SETIFER, new^ specie*. 



Plate 1, figs. 3-8. 



Outer half of keels yellow. The dorsum with a pale median longi- 

 tudinal stripe, each side of which is a broader dark brown band, the 

 region between this dark band and the marginal yellow of the keels 

 being a lighter brown due to an elongate pale area or group of light 

 dots on each tergite. Middle region of vertex and front of head 

 brown, the lateral portions yellow, as is also the clypeal region. 

 Venter yellow. Antennae and legs yellow, a little infuscated distally. 

 Body broad, five times longer than wide. Head minutely granular, 

 bearing numerous short setae. Gnathochilarium as shown in plate 

 1, figure 6. The first tergite is anteriorly widely emarginate, the 

 keels being rounded and bent forward and thus leaving the head 

 entirely uncovered. All tergites densely covered above over their 

 entire surfaces out to the ends of the keels with small tubercles or 



