NEUROPTEROID INSECTS FROM SZECHWAN — BANKS 179 



2. Radial sector toward tip with several branches from upper side 



to margin Sialis 



Radial sector without such branches, simply cross veins to 

 radius Indosialis 



3. First anal vein of forewings forks twice ; more than three radial 



cross veins (tribe Hermesini) 4 



First anal forks but once 5 



4. Ocelli small, round; anterior ocellus not transverse; wings 



heavily marked or all dark Hermes 



Ocelli large, elongate ; anterior ocellus plainly transverse ; wings 

 wholly pale Protohermes 



5. A distinct tooth on margin of head back of eyes; usually at 



least four radial cross veins (tribe Corydalini) 6 



No such tooth on head; usually but three radial cross veins 



(tribe Chauliodini) 7 



6. A spine or tooth on upper side of head each side ; clypeus very 



deeply indented in middle ; mandibles very large ; some costals 



crossed Acanthacorydalis 



No such spines on head ; clypeus only slightly, if at all, emargi- 



nate ; mandibles not so elongate ; costals usually not connected Neuromus 



7. Ocelli very small, laterals more than four diameters apart; 



antennae in both sexes pectinate; wings without prominent 



marks Ctenochauliodes 



Ocelli large, laterals not over three diameters apart 8 



8. Antennae of male pectinate, of female not at all; wings with 



spots, at least one in costal area before stigma Neochauliodes 



Antennae of neither sex pectinate, in male a little serrate ; wings 



without definite marks Parachauliodes 



Genus SIALIS Latreille 



SIALIS SINENSIS, new species 



Plate 29, Figure 52 



Body black, legs and antennae also; wings fumose, front pair 

 darker, almost black near base; head with the usual two submedian 

 stripes behind, not narrowed posteriorly, each side with two rows of 

 three rounded spots, and outside of these seven more or less elongate 

 spots. Surface of head not evenly punctate or granulose but covered 

 with many short, irregular ridges. The transverse suture above 

 antennae very distinct, in middle projecting angularly behind but 

 no impressed line or groove from this to the submedian elongate 

 spots. Pronotum a little more than twice as broad as long, a little 

 broader behind than in front, surface densely punctate. 



Forewings have the costal area but little swollen, less than in many 

 species, 10 or 11 costal cross veins; the cross vein from subcosta to 

 radius but little more than its length from origin of radial sector 

 (usually much farther) ; the three radial cross veins at about equal 

 distances apart and from base of radial sector, the latter arises 

 plainly beyond the oblique cross vein between medius and cubitus. 



