KNOWLEDGE OF THE NEOTKOPICAL THYSANOPTERA. 383 



obsolete. Chief spine on fore-coxa short and inconspicuous. Fore-femur 

 not strongly thickened^ three times as long as the breadth through the 

 centre, where it is widest ; tibia very slightly longer than the femur ; tarsus 

 unarmed. Intermediate and hind-legs long and slender, with coxse projecting. 

 Pterothorax wider than the prothorax and broadest at the juncture of the 

 meso- and metathorax, sides of the metathorax gently arcuate and narrowing 

 to base of abdomen. Wings reaching to the fifth abdominal segment. 



Abdomen narrower than the pterothorax, sides parallel to the fifth segment 

 and from thence very gradually narrowed to tube. Segments not strongly 

 transverse, each being long and very slightly wider than the length, with the 

 exception of the eighth segment, which is slightly longer than broad. Tube 

 very short, only slightly longer than the preceding segment and two-fifths 

 the length of the head ; twice as broad at base as at apex and evenly narrowed 

 from base to tip. Terminal hairs about the length of tube, weak. Abdominal 

 hairs long, those at the hind margin of the ninth segment being nearly twice 

 the length of the tube. 



Habitat. One female, Los Adjuntas, Venezuela, September 10th, 1891 

 {Meinert). 



Type. In the Copenhagen Museum. 



L. elongatus may be easily recognized by the form of the body-segments, the 

 long head, and the short and broad tube. 



LiOTHEiPS siMiLis, sp. nov. (PL 53. figs. 4-7.) 



$ . Length 3'5 mm., breadth of mesothorax 0*55 mm. 



Colour dark chestnut-brown, almost black, all tarsi brownish ; antennae 

 dark brown, second joint lighter and third joint clear yellow ; tip of tube 

 shaded to brown. 



Head one and three-quarters times as long as broad behind eyes and as the 

 length of prothorax, slightly widened anteriorly, and vertex broadly produced 

 in the form of a depressed hump ; cheeks set with a few minute and incon- 

 spicuous seta^, roundly and rather sharply constricted at base. Eyes small 

 and moderately finely facetted, less than one-quarter the length of head. 

 Post-ocular spines long and ante-ocular spines apparently obsolete. Ocelli 

 rather large and the posterior pair on a line drawn through the anterior third 

 of eyes. Antennae inserted under vertex, approximate at base, and more 

 than half as long again as the head ; third and fourth joints mildly clavi- 

 form, fifth to eighth fusiform ; third joint three times the length of second ; 

 fourth five-sixths of third ; fifth, sixth, and seventh four-fifths of the fourth, 

 fifth, and sixth respectively ; penultimate joint somewhat broadened, and the 

 apical one rounded at tip. Sense-cones slender, and the two apical joints 

 furnished with numerous sense-hairs. Mouth-cone nearly reaching to base 

 of prosternum ; maxillary palpi long and rather stout. 



LINN. JOURN. ZOOLOGY, VOL. XXX. 30 



