ASHMEAD : CLASSIFICATION OF THE CHALCID FLIES 239 



16. Tarsi 5-jointed 17 



Tarsi 3- or 4-jointed 31 



17. Apterous or with rudimentary wings 18 



Winged 34 



18. Antennse inserted on the anterior margin of the head or far below its middle ; clypeus not extending 



to the middle of the inner margin of eyes 19 



Antennse inserted on the middle of the face 30 



19. Head anteriorly with a large, deep, triangular fovea from which originate the antennse 20 



Head anteriorly without such a fovea ; wings entirely absent, not represented by filaments 25 



20. Wings represented by two pairs of thread-like filaments 21 



Wings represented by one pair of thread-like filaments or by bristles 22 



21 Head oblong, not or scarcely wider than the thorax, the eyes minute ; antennse separated by a sharp 



carina ; hind tarsi with the first joint dilated Philotrypesis Forster. 



Head large, oblong, slightly narrowed anteriorly, the hind margin sinuate, the hind angles rounded, 

 setose ; antennse 8- or 9-jointed with 1 ring-joint, the scape large, clavate ; mandibles large, porrect, 

 curved, acute and entire at apex, but within, 3-dentate. 



Tetranemopteryx Ashmead, g. nov. (type Sycoscapter 4-setosa Westw.). 



22. Head oblong, the hind angles rounded, not acute 23 



Head oblong-quadrate, the hind angles acutely produced, not rounded 24 



23. Head large, oblong, broader than the thorax ; antennse 10-jointed, iviih 1 ring-joint inserted close 



together near the front margin of the head ; mandibles porrect, stout and curved, the tips acute, 



entire, the inner margin with a tooth behind the middle Sycoscapter Westwood 



(type S. insignis Westw.). 



Head oblong-quadrate, sinuate posteriorly ; antennse 8- or 9-jointed, without a ring-joint, inserted close 



together near the mouth ; mandibles porrect, falcate, the tips bidentate, the inner margin with a 



tooth near the base Sycoscapteridea Ashmead, g. nov. (type Sycoscapter monilifer). 



24. Head oblong, the sides anteriorly nearly straight, the front angles rounded, the hind angles acutely 



produced ; antennse 8-jointed (or 9-jointed with 1 ring-joint), inserted close together near the mouth ; 

 mandibles small, falcate, entire ; wings represented by short filaments. 



Sycoscapterella Ashmead, g. nov. (type Sycoscapter anguliceps Westw.). 



25. Antennse shorter, at the most 9-jointed, the joints closely united, inserted further from each other than 



to the sides of the head, most fi-equently with only 4 or 5 free joints 26 



Antennse longer, 10- or 11-jointed, with only the last three joints closely united, inserted near or not 

 far away from the mouth border 27 



26. Head between the clypeus and the sides concave ; mandibles bidentate ; labium and palpi wanting, in 



place is a membranous tube ; antennse composed of 4 free joints, of which the third is small, 



annular, transparent and membranous Idarnes Walker. 



Head between the clypeus and side flat ; mandibles 3- or 4-dentate ; labium and labial palpi present, 

 the palpi 1-joiuted ; tibise short, closely and thickly spinous ; antennse with 4 or 5 free joints. 



Head depressed, wider than long, but not pei'fectly flat, more or less triangular, the angles 



rounded Trichaulus Mayr. 



Head pei'fectly flat, longer than wide, trapezoidal ; mandibles broad, 4-dentate within ; 

 antennse 5-jointed, the scape flat, dilated towards apex Koebelea Ashmead. 



27. Head more or less depressed ; tarsi 5-jointed, the basal joint of hind tarsi often much compressed and 



with very long bristles. 



