KNOWLEDGE OF THE NEOTROPICAL THYSANOPTERA. 385 



Habitat. Two females, Los Adjuntas, Venezuela, September lOth, 1891 

 [Meinert^. 



Type. In the Copenhagen Museum. 



Genus DiCERATOTHRiPS, Bagnall, 1908. 



DiCERATOTHRIPS ARMATUS, Sp. nOV. (PI. 53. figS. 12-16.) 



? . Length 5'0 mm., width of mesothorax 0"65 ram. 



Colour brownish black. 



Head nearly one-half as long again as the width at base and about one- 

 third longer than the prothorax ; widened anteriorly, being widest behind 

 eyes. Frons truncate ; cheeks set with a few moderately stout spines. 

 Eyes small and moderately finely facetted ; post-ocular spines long. Ocelli 

 large, posterior pair set on a line with the centre of eyes and close to their 

 margins, and the anterior ocellus set in centre of forehead and protected by 

 a pair of forwardly-directed spines, which are rather long and set close to 

 the margins of eyes in front. Antennae separated at base, inserted under 

 vertex, and about twice the length of the head ; first joint cylindrical, 

 concealed at base ; second elongate and slightly constricted at basal 

 joints ; 3 to 5 claviform and 6 to 8 fusiform. Third joint three times the 

 length of the second ; fourth two-thirds of third ; fifth, sixth, and seventh 

 four-fifths of the fourth, fifth, and sixth respectively ; and the apical joint 

 five-eighths the length of the penultimate. Sense-cones moderately long 

 and acute, light-coloured, and a series of sense-hairs from tip to base of 

 apical joint and continued down the apical third of the penultimate joint. 

 Mouth-cone long and somewhat sharp, almost reaching to the base of the 

 prosternum. 



Prothorax not quite twice as broad across fore-coxse as long, smoothly 

 widened from anterior margin to basal third. Spines at each hind-angle 

 very long ; posterior-marginal spines short but stout ; anterior-marginal 

 pair and those at each anterior angle short and set well back, and the mid- 

 lateral pair apparently absent. Pterothorax almost square, widest before the 

 juncture of the meta- and mesothorax. Fore-coxa with one conspicuous 

 spine ; fore-femur twice as long as broad, set with a few strong, short spines 

 near the base without and about the middle within, and two long bristles on 

 the outer margin, one on the mid-line and the other before apex. Fore- 

 tibia rather long and stout and the tarsus armed with a small tooth. Inter- 

 mediate and posterior femora armed with several short but strong spines, 

 and tibiae set with similar spines at apices and with one or two long hairs. 

 Wings long and broad, smoky yellow. 



Abdomen almost as broad as the pterothorax, gradually narrowed to tube 

 from the sixth segment. Tube about one-eighth longer than head, tapering 



