ABERRANT COLEOPTERA. 



Male. Mouth parts in a state of atrophy, except man- 

 dibles and two palpi ; head prominent, vertical, transverse, 

 prolonged on sides ; eyes prominent, very strongly granu- 

 late, carried by lateral projections of head ; antennae 

 inserted on inner-side of base of latter, with from four to 

 seven joints, forked ; prothorax and mesothorax very 

 short, soldered together, metathorax extremely large ; 

 elytra membranous or leathery, very small and narrow ; 

 wings very large, fan-shaped; legs moderately long, feeble; 

 coxae short, nearly globular, the front pairs placed a little 

 apart at base, the posterior pair almost contiguous ; tro- 

 chantina very elongate and prominent ; tibiae without 

 apical spines ; tarsi with from two to four joints, with 

 membranous prominences beneath, without claws ; abdo- 

 men with from seven to nine segments. 



Female. Apterous and larva-like. 



Parasitic on certain Hymenoptera ; female imago partly 

 enclosed between abdominal segments of its host through- 

 out its life ; male imago living at longest a single day. 



Stylopidae. 



STYLOPIDAE. 



A. Tarsi with four joints. 



Antennae with six joints, first elongate, second and third 

 very short, latter with a long process, fourth much larger 



