414 Pomona College Journal of Entomology 



1. First ventral segment of abdomen not extending in front of the 



hind coxas ; hind tarsus with two claws or a compound claw at tip ; 

 palpus with the tibia and tarsus depressed; hind legs usually the 



longest 2 



First central segment of abdomen extends much in front of the 

 hind coxje ; each tarsus with but one simple claw ; palpus with tibia 

 and tarsus cylindrical ; second pair of legs the longest 5 



2. Hind cox.-e wholly united to the venter, spiracles distinct Cynorta 



Hind cox;e free at apex, spiracles obscure 3 



3. Two simple claws to each hind tarsus 4 



A forked claw on each hind tarsus ; palpus not as long as body 

 Sclerobunns 



Figure 148. Head details of Phalangida: 



A, Eye tubercle of Ortholasma pictipes; B, head and elaw of Sitaleiua californica; 

 C, head of Ortholasma rugosa. 



4. Eye-tubercle arising from the anterior margin of the cephalothorax ; 



palpi shorter than the body Sitalcina. 



Eye-tubercle arising some distance back from the anterior margin 

 of the cephalothorax ; palpi longer than the body Scotolemon. 



5. Last joint of palpus with a claw at the end, this joint usually longer 



than the preceding joint 10 



Last joint of palpus without a claw at tip, this joint much shorter 

 than the preceding joint 6 



6. Palpi very short, concealed under a projection of the eye-tubercle 9 



Palpi long and prominent 7 



7. Mandibles longer than body, projecting forward .'. Taracus. 



Mandibles shorter than body 8 



8. Fourth joint of paljuis much thickened Phlegmacera. 



Fourth joint of palpus not thickened Ncmastotna. 



9. Eye-tubercle with a broadly spatulate projection ; two spines each side 



on the anterior margin of cephalothorax Ortholasma. 



Eye-tubercle with liranchccl projection, a single and club-like spine 

 each side on the anterior margin of cephalothorax Dendrolasma. 



