A REVISION OF THE GENUS LEPTOTHORAX. 9 



Note. The following remarks may be of some help to beginners 

 in myrmecology in naming the ^ s of this genus. 



1. Antennae uniform in colour. L. mjlawhri and corticalis. 

 The former has a slight impressed line between the mesonotum and 

 metanotum, and long spines. The latter has no impressed line, and 

 very short spines, except in the variety. 



2. Antennal club darker than the rest. L. affinis has very long, 

 thin, curved spines, and club of antennae only slightly darker. L. 

 tuhcriim (s.str.) has shorter and broader spines, whole of head dark, 

 and club extremely dark. 



L. interruptiis has long spines, only the front of head dark, and 

 club very dark. L. unifasciatiis always has sharply defined dark band 

 across the first segment of garter, and spines short. Front of head 

 and club only slightly darker. 



FEMALES. 



Table of ? ? . 



Antennae 11- jointed .. .. .. .. .. .. .. L. acervoru7n,F. 



Antennffi 1'2-jointed . . . . . . . . . . . . • . . . . . 1. 



1. Club no darker than rest of antenna . . . . . . . . . . . . 2. 



Club darker ,, ,, ,, •• •• •• ■• •• •• ..3. 



2. A sharply defined broad dark band across base of first segment of gaster, 



and a narrow one on each of the following segments. Spines long. 



L. tiiberuvi, F. sub-sp. nylanderi, Foerst. 



Gaster without bands. Spines short . . . . . . Sub-sp. corticalis, Sch. 



3. Spines long . . . . . . . . . . . . . . . . . . . . 4. 



Spines short . . . . . . . . . . . . . . . . . . 5. 



4. Mesonotum coarsely striated. Club brown . . . . sub-sp. affinis, Mayr. 

 Mesonotum and scutellum finely striated. Club nearly black 



sub-sp. tuherum {s.str ), F. 

 Like the preceding, but with scutellum smooth and shining in centre, and 

 longer spines . . . . . . . . . . . . sub-sp. inter rupttts, Sch. 



5. A sharply-defined broad dark band across base of first segment of gaster, and a 



narrow one on each of the following segments sub-sp. unifasciatus, Latr. 



Antenna 11-jointed. Eadial cell open. Middle of clypeus almost always 

 smooth, slightly concave from the anterior to the posterior border. 



Spines as in 5 . Wings clear, legs hairy. Colour as in g ; upperside of head, 

 thorax and often pedicel, gaster, and antennal club, dark blackish brown. 

 Mesonotum sometimes yellow with patches of dark brown. 



L. 4mm.-4-5mm L. acervorum (s.str.), Fabr. 



Antennge 12-jointed. Clypeus not concave in middle, but longitudinally striate. 

 Wings clear ; radial cell small and closed. Legs without hairs. 

 . . . . L. tuberum, Fabr. 



Mesonotum finely striated longitudinally. Middle of scutellum smooth and 

 shining. Spines long, one-third as long as basal face of epinotum. 



Yellow ; club of antennre no darker ; a broad band across the base of first seg- 

 ment of gaster, and a narrow one across the bases of the following segments, 

 dark blackish-brown. The head, thorax, and pedicel sometimes dark brown. 



L. 4-2mm.-4-5mm Sub-sp. nylanderi, Foerst. 



Mesonotum and scutellum finely striated longitudinally. Spines short, 

 nearly horizontal. 



Antennae, mandibles, and legs entirely reddish-yellow ; the rest of the body 

 dark brown. 



L. 3-5mm.-4mm Sub.-sp. corticalis, Sch. 



This description is taken partly from Schenck and partly from 

 Forel (v. sub. ^ ). 



