4: JIESSUS. R. E. TURNER AXU J. WATERSTON ON THE 



Dentiparal area more coarsely sculptured than 



the external or both smooth and sliiiniig- 13. 



12. Antennae from 50- to 55-jointed; hind tarsi fer- 



rn^inous, median segment with a transverse 



yellow fascia L. multiarticiilatum, sp. n., 



Antenna3 45- to 4.6-jointed; hmd tarsi black [p. 23. 



from before the apex of tlie metatarsus, median 

 segment without a j'ellow fascia L.fidvicome, sp. n., p. 22. 



13. Hind femora black, very narrowly yellow at the 



apex L. sculpt iiratum, sp. n., $ , 



Hind femora ferruginous, at most narrowly black [p. 14. 



at the base and apex 14. 



14. Antennse more than 40-jointed 15. 



Antennai less than 40-jointed 18. 



15. Mandibles bidentate ; basal tergites narrowly 



margined with yellow L. Jiohartense, sp. n., p. 20. 



Mandibles simple 16. 



16. Dentiparal area unarmed, areola, external area, 



and dentiparal areae smooth L. longicorne, sp. n., S , p. 23. 



Dentiparal area armed, the carinas strongly raised 



forming;- small teeth at the outer angles 17. 



17. Antenuie 47-jointed ; face yellow, closely and 



evenly punctured L. approximatum, sp. n., (J, 



Antenuie 43-jointed : face ferruginous, margined [p. 21. 



with yellow laterally, centrally rugulose L. spiniferum, sp. n., p. 12. 



18. Third and •'burth antennal joints subequal 19. 



Third antennal joint much longer than the 



fourth 20. 



19. Mandibles strongly bidentate ; hind femora 



shining, with large and rather sparse punctures. L. occidentale, sp. n., p. 16. 

 Mandibles very obscurely bidentate ; hind femora 

 subopaque, very closely covered with minute 

 punctures L. subcequale, sp. n., p. 15. 



20. Distance between the recurrent and second trans- 



verse cubital nervures not equal to more than 

 one-third of the length of the latter nervure; 



ncr vulus very distinctly postf ureal L. clavicorne Mori. , p. 19. 



DistHUce between the recurrent nervure and the 

 second trau'iverse cubital nervure equal to at 

 least half the length of the latter nervure ; 

 nervulus interstitial or very slightlj' post- 

 turcal 21. 



21. Petiole black, except at the apex ; mesopleurae 



extensively black superiorly L. montivagum, sp. n., p. 16. 



Petiole mainly ferruginous ; mesoplenrse with 



very little black i. associatum, sp. n., p. 20. 



Labium bicolor BruUe is not included in the Key, as we have not seen a 

 spechnen. It is described from a male, and has the hind femora black as in 

 L. sculpturatii'm, to which, from the description, it appears to be related. 



Labium walkeri, sp. n. (Text-fig. 2.) 



S • Niger ; mandibulis, apice brunneis, labro, clypeo, facie, 

 fronteque lateribus, genis, orbitis externis, scutello, basi anguste 

 nigro, postscutello, tegulis, mesopleuris maculis dnabus, epiineris, 

 pedibus anticis intevmediisqiie, tarsis intermediis bi'unnescentibus, 

 coxis posticis apice, trochanteribus posticis, genu bus, tibiisque 

 posticis dimidio basali, basi angiistissime bruuneo annulatis, 

 flavis; autennis subtus rufescentibus ; femoribus posticis medio 

 la.te rufescentibus, basi atque apicein versus nigrescentibus ; 

 calcaribu.s pallidis ; alis subhyalinis, veuis f uscis : petiolo apice 



