38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 5S. 



KEY TO THE SPECIES OF LERNAKA. 



1. Two cephalothoracic horns, a lateral pair 2 



1. Three cephalothoracic horns, a lateral pair and one dorsal and unpaired 3 



1. Four cephalothoracic horns, a dorsal pair and a ventral pair 5 



2. Horns directed laterally at right angles to body axis ; trunk not much wider 



than neck; pregenital prominence inconspicuous (8.40 mm.)* 



diccraccphala (Cunnington), 1914. 



2. Horns diagonal to body axis, directed posterodorsally ; trunk suddenly en- 



larged to four times the diameter of neck ; pregenital prominence very 

 large (S nmi.) new species*. 



3. Lateral and dorsal horns all dichotomously branched 4 



3- Lateral horns simple, dorsal one bified at apex; pregenital prominence incon- 

 spicuous; abdomen short (10 nun.) new species*. 



3. Lateral horns three or four pronged, dorsal horn bifid at apex; pregenital 



prominence conspicuous; body clubshaped ; abdomen long and wide (7.50 

 mm.) pcctoralis (Kollicott), 1SS2. 



4. Lateral horns once bifid, dorsal horn twice bifid; body spindle-slmped ; no 



pregenital prominence (S mm.) lof/cniila (Heller), 1SG5. 



4. All three horns twice bifid; body club.shaped ; pregenital prominence divided, 

 Its two lobes and the abdomen the same size (10 mm.) 



catostomi (Krfyer), 1S(>3. 



4. Lateral horns twice bifid, dorsal horn simple or once bifid ; trunk clubshaped; 



pregenital prominence simple and much smaller than the alxlomen (12 

 nun.) tortna (Kellicott), 1SS2. 



5. Dorsal and ventral horns about the same size 6 



5. Ventral horns much smaller than the dorsal 9 



C. Pregenital prominence simple and shorter than the abdomen 7 



6. Pregenital prominence divided, its lobes as long as the abdomen 8 



7. Abdomen short and plump; pregenital prominence forming a distinct "heel"; 



ventral horns bifid (5.70 mm.) phoxinucca (Krfyer), 1SG3. 



7. Abdomen short and plump; pregenital prominence not forming a distinct 

 " heel "; dorsal horns bifid (13.50 mm.) esocina (Burmelster), 1S35. 



7. Abdomen long and stout; pregenital prominence forming a distinct "heel"; 



all the horns simple (14.30 mm.) haploccphala (Cunnington), 1914. 



8. Pregenital prominence divided into three broadly rounded lobes; horns long, 



slender, straight (13.50 mm.) pomotidis (Krj^yer), 1SG3. 



8. Pregenital prominence twice bifid, forming four narrow lobes; horns short, 



plump, curved (10 mm.) cruciata (Le Sueur), 1S24. 



9. Pregenital prominence divided into distinct lobes; dorsal horns simple and 



undivided 10 



9. Pi'cgenltal prominence simple or only slightly indented; dorsal horns dis- 



tinctly forked 11 



10. Abdomen a short and broad triangle; dorsal horns cylindrical and standing 



out laterally at right angles to the body axis (9 mm.) 



tennis (Wilson), 1916. 



10. Abdomen long and pluraply conical ; dorsal horns flattened dorso-ventrally 



and curved forward in front of the head and parallel to the body axis 

 (11.50 mm.) variabilis (Wilson), 191G. 



11. Abdomen short and inclined to body axis; egg cases broadly elliptical; 



ventral horns mere knobs (14 mm.) barnimii (Hnrtmann), 1870. 



1 Avora;?e total length of .=pocies. 



• Named and described In the monograph mentioned under i-emarks, p. 37. 



